US20010014212A1 - Fibrous supported polymer encapsulated electrical component - Google Patents
Fibrous supported polymer encapsulated electrical component Download PDFInfo
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- US20010014212A1 US20010014212A1 US09/840,513 US84051301A US2001014212A1 US 20010014212 A1 US20010014212 A1 US 20010014212A1 US 84051301 A US84051301 A US 84051301A US 2001014212 A1 US2001014212 A1 US 2001014212A1
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- electrical
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- electrical device
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- fibrous support
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
- H05B3/36—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in insulating material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
- H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/013—Heaters using resistive films or coatings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
Abstract
Description
- The present application is a continuation of U.S. application Ser. No. 09/309,429, filed May 11, 1999.
- This invention relates to polymer encapsulated electrical components, and more particularly, to fibrous support layer reinforced electrical components, such as electrical resistance wires and integrated circuits, encapsulated in a polymeric layer.
- Electrical resistance heating elements are used in many industrial, commercial and residential applications. They have been used to heat electroplating baths in the plating industry and can be found in the baseboard heaters of many homes. A typical construction for an electrical resistance heating element includes a pair of terminal pins brazed to the ends of a Ni—Cr coil, which is then axially disposed through a U-shaped tubular metal sheath. The resistance coil is insulated from the metal sheath by a powdered ceramic material, usually magnesium oxide.
- More modern heating elements have been developed using polymeric insulating materials around a resistance heating wire, such as disclosed in U.S. Pat. No. 5,586,214. These more recent devices employ resinous coatings which are often injection molded over the resistance wire. Since resistance wire is often extremely pliable, injection molding pressures are known to distort the circuit pattern for the wire in unacceptable ways. One solution described in the '214 patent is to provide a polymer inner mold having a series of grooves for receiving the wire and holding it in place while a thermoplastic coating is injection molded over the assembly. This technique has been difficult to implement when thermoplastic materials are loaded with significant amounts of ceramic additives. Such mixtures are viscous and require great pressures of 10,000-25,000 psi to fill the mold properly. Even high mold pressures are sometimes insufficient to fill the details of the mold properly and the greater the mold pressure, the more stress is applied to the circuit pattern.
- In still a further method described in U.S. Pat. No. 3,968,348, a resistance heating wire is disposed between a pair of fiberglass mats. A third fiberglass mat carries a heat dissipating metal foil. The three mats are separately impregnated with a thermosetting polyester resin and cured together to form a rigid, fluid impervious laminated structure. While laminating techniques have occasionally produced acceptable products, they often leave air gaps in the cross-section which make uniform heating difficult. Additionally, insufficient bonding to the glass mats or resistance wire can cause delamination, especially due to the difference in thermal expansion rates during heating and cooling cycles.
- While such methods for creating resistance heating elements with thermoplastic or thermosetting polymers are known, there remains a need for better manufacturing processes which can further reduce the cost and improve the quality of polymer heaters. There also remains a need for more structural integrity during heating cycles and more effective thermal dissipation of heat from the resistance wire.
- The present invention provides polymer coated electrical components and methods of fabricating such components, and is particularly useful in the manufacturing of electrical resistance heating elements. In one preferred embodiment of the invention, an electrical device is provided having a portion having a relatively thin cross-section, which is normally susceptible to distortion or dislocation by a viscous flow of a liquid or semi-liquid polymeric composition during an encapsulation of said electrical device by said polymeric composition. The electrical device is supported by a fibrous support layer disposed with the device. A polymeric layer is substantially encapsulated around the fibrous support layer and the electrical device.
- It is known from experience that the application of polymeric material under pressure to delicate electrical devices can distort or move such devices in a mold. This invention employs a fibrous support layer to support electrical devices, such as thin gauge resistance heating wire, to provide structural support to the relatively thin cross-section of the electrical device so that a viscous polymeric composition can be used to encapsulate the device without distortion, displacement or loss of quality control.
- The devices and methods of this invention enable relatively thin cross-sections as small as 0.01-0.3 cm to be encapsulated without distortion. The fibrous support layers of this invention help to maintain stability of viscous flows of thermoplastic or thermosetting material and act as a ballast or dampening factor. They also can be porous enough to allow the flow of polymeric material to penetrate through their pores so as to thoroughly coat the fibers and the electronic device. The flowing of polymeric materials through the fibrous support layers of this invention help to “wet” the fibers of these support layers to avoid a fracture initiation site along the boundary between the support layers and polymer, which has been known to cause part failure, especially when a part is heated.
- The use of polymeric preforms in the manufacturing techniques of certain embodiments of this invention helps to more evenly distribute polymeric material over a greater amount of the device's surface. The use of preforms and compression molding together, when compared to older injection molding techniques, distributes the molding forces more uniformly along the surface of the fibrous support layer to minimize movement of the electronic device during molding, and assist in the creation of a unified hermetic structure. Additionally, when thermosetting polymers are used, the use of the preform and fibrous support layers of this invention permits a lower compressive force to be used to liquefy thermosetting resins to permit them to flow properly. The preferred glass mats of this invention also improve the flexural modulus of the component by at least 50% over the unreinforced polymer used for encapsulation, and, preferably, have an air permeability rating of at least about 500 ft3/min.
- The accompanying drawings illustrate preferred embodiments of the invention as well as other information pertinent to the disclosure, in which:
- FIG. 1: is a front perspective view of a insulated electronic electrical component of this invention;
- FIG. 2: is a top, cross-sectional view of the electrical component of FIG. 1, taken through line2-2;
- FIG. 3: is a right side, cross-sectional view of the electrical component of FIG. 1, taken through line3-3, and illustrating the component parts in diagrammatic illustration;
- FIG. 4: is an exploded front perspective view of an alternative encapsulated semiconductor chip component of this invention illustrating conductor paths located on the fibrous reinforcement; and
- FIG. 5: is a flow diagram of a preferred method of manufacturing the insulated electrical components of this invention.
- As used herein, the following terms are defined:
- “Substantially Encapsulating” means that at least 85% of the surface area of the designated member is provided with polymeric material, but does not necessarily mean that the coating is hermetic;
- “Serpentine Path” means a path which has one or more curves for increasing the amount of electrical resistance material in a given volume of polymeric matrix, for example, for controlling the thermal expansion of the element;
- “Melting Temperature” means the point at which a polymeric substance begins to liquefy because of heat;
- “Degradation Temperature” means the temperature at which a thermoplastic or thermosetting resin begins to lose its mechanical or physical properties because of thermal damage;
- “Melt Bond” means the bond between two members integrally joined, whereby the atoms or molecules of one member mixes with the atoms or molecules of the other.
- “Low Volatile Content” means polymeric mixtures, suitable for adhesives, which contain less than 10 wt % volatile components after full set, for example, during use in the final component.
- The present invention provides insulated electrical components, including an electrical device having a relatively thin cross-section, a fibrous support system disposed over the electrical device and a polymeric layer substantially encapsulating the fibrous support and the electrical device whereby the fibrous support provides structural support to the relatively thin cross-section of the electrical device when the polymeric layer is applied in a mold under pressure.
- The electrical components and heating elements of this invention are designed to operate at power ratings of as low as 5 watts and as great as 10,000 watts with watt densities of 5 watts/inch2 to about 25 watts/inch2. For example, heating elements can be produced for heating paper in an ink jet printer at watt densities of only about 5-8 watts/inch2 using a polymeric layer of polyphenylene sulfide, epoxy or silicone without thermally conductive additives. On the other hand, immersion heaters for heating hot water can be produced with watt densities of about 20-25 watts/inch2 by using an epoxy resin loaded with about 50 weight percent Al2O3 or MgO ceramic powder with about 5-10 weight percent glass fiber reinforcement.
- Although the invention contemplates using a glass mat layer adhered to an electrical resistance heating wire, teachings are also provided for encapsulating integrated circuit components, such microchips or small circuit boards, power sources, transformers or magnetic devices. Such devices can optionally include a thermostat or thermistor control for regulating current through the device upon reaching a pre-selected temperature limit.
- In a first embodiment of the invention, shown in FIG. 1, a
heating element 100 is provided having anend cap portion 18, a pair of terminalelectrical conductors temperature control device 10, such as a thermistor or thermocouple, for regulating the current through theelement 100 to protect against overheating. - The preferred
circuit 22 of theheating element 100 of this invention is illustrated in the cross-sectional view of FIG. 2. Thecircuit 22 includes a resistance heating material, which is ideally aresistance heating wire 26 wound into a serpentine path containing about 20-51 windings, or, a resistance heating material, such as a foil or printed circuit, or powdered conducting or semi-conducting metals, polymers, graphite, or carbon. Alternatively, a laser trimmed or photoetched Al or Cu foil could be employed. More preferably theresistance heating wire 26 includes a Ni—Cr alloy, although certain copper, steel, and stainless-steel alloy wires could be suitable. Whatever material is selected, it should be electrically conductive, and heat resistant. The resistance heating wire is preferably terminated with agrommets cold pins electrical conductors - With reference to FIG. 3, there is shown in magnified cross section, a preferred detailed construction of a
heating element 100 of this invention. Theelement 100 of this embodiment includes thepolymer layer 113 or matrix, which is preferably of a high-temperature variety including a melting or degradation temperature of greater than 93° C. (200° F.). High temperature polymers known to resist deformation and melting at operating temperatures of about 75-85° C. are particularly useful for this purpose. Both thermoplastics and thermosetting polymers can be used. Preferred thermoplastic materials include, for example, for higher temperature applications: fluorocarbons, polyaryl-sulphones, polyimides, and polyetheretherkeytones, polyphenylene sulfides, polyether sulphones, and mixtures and co-polymers of these thermoplastics. Preferred thermosetting polymers include epoxies, phenolics, and silicones. Liquid-crystal polymers can also be employed for improving high-temperature use. The most preferred materials for the purposes of the current embodiment of this invention are compression or sheet molding compounds of epoxy reinforced with about 50-60 wt % glass fiber. A variety of commercial epoxies are available which are based on phenol, bisphenol, aromatic diacids, aromatic polyamines and others, for example, Litex 930, available from Quantum Composites, Midland, Mich. - For lower temperature use, less expensive polymers such as polyethylene, polypropylene, or polyvinylchloride could be used.
- As stated above, the polymeric layers of this invention preferably also include about 1-60 wt. %, more preferably about 5-10 wt. %, reinforcing fibers, such as glass, carbon, aramid, steel, boron, silicon carbide, polyethylene, polyimide, or graphite fibers. The
fibers 112 of FIG. 3 can be disposed throughout the polymeric material prior to molding or forming theelement 100, in single filament, multifilament thread, yarn, roving, non-woven or woven fabric. - In addition to reinforcing fibers, this invention contemplates the use of thermally conducting, preferably non-electrically conducting,
additives 110 shown in FIG. 3. The thermally-conductingadditives 110 desirably include about 30-70 wt. % ceramic powder, flake or fiber, such as, for example, Al2O3, MgO, ZrO2, Boron nitride, silicon nitride, Y2O3, SiC, SiO2, TiO2, etc., or a thermoplastic or thermosetting polymer which is more thermally conductive than the polymer matrix suggested to be used with thepolymer layer 113. For example, small amounts of liquid-crystal polymer or polyphenylene sulfide particles can be added to a less expensive base polymer such as epoxy or polyvinyl chloride, to improve thermal conductivity. - In order to support the preferred
resistance heating element 100 of this invention, afibrous support layer 114 is desirably employed to hold it in place while thepolymer layer 113 is applied under pressure. Thefibrous support layer 114 should allow the polymeric resin of theheating element 100 to flow through its structure so as to encapsulate the preferredresistance heating wire 26 or material. However, it should be resilient enough to allow viscous polymer materials, which contain large amounts of glass fibers and ceramic powder, to pass through its course openings without substantially deforming thecircuit 22. It will become apparent to one of ordinary skill in the art that thecircuit 22 will employ resistance wire having a very fine diameter or cross-sectional thickness, preferably, about 0.01-0.3 cm or less, and that compression molding or injection molding, for example, could cause a dislocation force, pushing theresistance heating wire 26 or other electrical device into the mold wall surface. This could cause unintentional shorts or rejected components. - In the preferred embodiment of this invention, the fibrous support layers114 comprise resilient nonconducting fibers, such as those made from glass, boron, rayon, Kevlar aramid, or other polymers, for example, fibers made from the same polymer as the matrix of the
polymer layer 113. More preferably, the supporting layers include a pair of non-woven cut glass mats, such as Dura-Glass glass mat from Johns Manville having an air permeability rating of at least 1000 ft3/min. for thermosetting resins and at least 500 ft3/min. for low viscosity thermoplastic resins. Dura-Glass mats are relatively thin, non-woven, fiberglass mats composed of cut glass filaments oriented in a random pattern, bonded together with a resinous binder, such as modified acrylic. - The fibrous support layers114 of this invention can be bonded with adhesive 116 to the
resistance heating wire 26 or other electrical device. Good examples of adhesives useful for this purpose include 3M 77 and 4550 spray adhesives. More preferably, the adhesive 116 is a low volatile content adhesive such as acrylic, epoxy, silicon, phenolic, or ester-based adhesives, which can be extruded or molded around aresistance heating wire 26, or other electrical device, or applied as a paste between the electrical device and the fibrous support layers 114. Such adhesive substances can be thermally conductive, or include thermally conductive additives, such as Al2O3, MgO, etc. in amounts of about 30-70% wt. to increase thermal dissipation from the electrical device and permit greater watt densities, such as those greater than 5 watts/in2 without burning or melting thepolymer layer 113. Such thermally conductive, low volatile containing adhesives should effectively wet the fibrous support layers and electronic device, helping to join them together. They also should minimize air gaps between the fibrous support layers 114 and the polymer layers 113, to create more homogenous heat dissipation. They also can increase the tensile strength of theelement 100 in cross-sectional direction marked by line 3-3 of FIG. 1, by discouraging delamination along the fibrous support layers 114 during heating and cooling cycles. - With reference to FIG. 4, there is shown an
integrated circuit encapsulation 300, including an integrated circuit or “silicon chip” 305 having a plurality of leads 312. Thechip 305 of this embodiment can be a microprocessor or memory chip, for example, or a small circuit board having a small cross-sectional dimension, e.g., less than about 0.01-0.3 cm, and designed to be encapsulated in a thermoplastic or thermosetting material. As shown in FIG. 4, theintegrated circuit 305 can be disposed on a firstfibrous support layer 324, which can have a pattern ofconductor paths 308 disposed thereon. Such paths can be copper traces electroplated, photo etched, or applied with a foil and then laser trimmed to produce an electrically conductive path to the edge of thefibrous support layer 324. Thesupport layer 324, together withfibrous support layer 322, helped to provide structural support and a more uniform heat dissipation from thesilicon chip 305. The fibrous support layers 324 and 322 can be made of the same materials as the fibrous support layers 114 disclosed previously. Ideally they are made of a non-conductive material, such as a non-woven glass mat. After the fibrous support layers 324 and 322 are joined together with a suitable adhesive substance to entrap thesilicon chip 305, they are placed with thesilicon chip 305 between a pair of polymeric layer preforms 310 and 320 in a compression molding device. The polymeric layer preforms 310 and 320 can optionally include thermallyconductive additives 314 andfibrous reinforcement 316, as discussed previously for theheating element embodiment 100. - As shown in FIG. 5, a preferred flow diagram for manufacturing heating elements and other electrical components is provided. The operation begins by preparing a drawing of the device on an
appropriate computer program 201. Apin layout step 202 is provided to locate an electrical resistance wire, for example, in a circuit path. A two dimensional windingoperation 204 is then used to dispose the electrical resistance wire along the pin layout over a bottom mat which is fed from abottom mat feeder 203. Simultaneously with the arrangement of the resistance wire along the pin layout, atop sheet feeder 205 disposes a top fibrous support layer into anadhesive operation 206 where the adhesive is applied to at least the top fibrous support layer. Alternatively, a foil, instead of a resistance wire, can be disposed on the bottom mat and then laser etched to create a circuit path. Or, in a further embodiment, a thermally conductive adhesive can be applied to an electrical resistance wire which is then disposed and adhered between the top and bottom fibrous support layers. Optionally, stitching can be used instead of, or in addition to, adhesive. - The two fibrous support layers114 are then joined with the wire, foil or device in the
capture step 210. The fibrous support lay is then trimmed by a cutter attrim step 211 followed by atermination step 212, in which the ends of the conductive resistance heating wire are terminated by crimping a grommet and cold pin to each end of the wire. Following termination, the element precursor is inserted between a pair of polymer layers or preforms. These polymer preforms can include an optional cavity shape or curvature for receiving the wire or chip, or they can be flat. - The polymer preforms are disposed on both sides of the element precursor and then subject to a preferred compression molding operation.
- When epoxy is used as the polymeric resin, the platen temperature is set at about the cure temperature for the resin, or about 350-450° F. The platens are adjusted to a compressive load of about 500-4,000 PSI, which allows the epoxy to flow slowly through the porous glass mat layers and permit the epoxy resin to wet and bond to the glass and electrical resistance wire surfaces. At this point, the resin has a viscous yet fluid nature for flowing through the porous fibrous support layers.
- It has been observed that when the polymer preforms are in place in the mold, they tend to distribute the viscous epoxy material uniformly throughout the mold, requiring less force to liquefy. Usually less than 5,000 psi is required to liquefy and permit the resin to flow, which is substantially less than most injection molding operations which require over 10,000 psi generally to fill the mold with a molten polymer.
- It has also been observed that the preferred fibrous support layers114 of this invention, glass mats having an air permeability rating of at least about 1,000 ft3/min., help to maintain the stability of the flow of resinous material and create a ballast or dampening factor as the liquefied epoxy flows through the glass material. This permits the electrical component or resistance wire to substantially hold its circuit path placement and location in the mold during resin infiltration. It also substantially eliminates a fracture initiation site along the glass mat during use, since the resin wets and bonds to the glass fibers and resistance wire and forms a substantially continuous phase through the cross-section of the product.
- From the foregoing, it can be realized that this invention provides improved heating elements and other electrical devices which contain fibrous support layers and improved processing features for helping to develop improved properties. These properties include greater wetting of the fibrous reinforcement and more resistance to fracture along the fibrous reinforcement polymer boundary, especially during heating cycles. Conductive polymer materials are also disclosed for improved thermal dissipation from electrical resistance wire or other devices to improve watt density without burning the disclosed polymer coatings. Compression molding techniques are also provided which include improved ballasting techniques for easier molding and fibrous mat reinforcement for increasing the strength of polymer heaters. Although various embodiments have been illustrated, this is for the purpose of describing and not limiting the invention. Various modifications, which will become apparent to one skilled in the art, are within the scope of this invention described in the attached claims.
Claims (24)
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US09/840,513 US6434328B2 (en) | 1999-05-11 | 2001-04-23 | Fibrous supported polymer encapsulated electrical component |
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US09/309,429 US6263158B1 (en) | 1999-05-11 | 1999-05-11 | Fibrous supported polymer encapsulated electrical component |
US09/840,513 US6434328B2 (en) | 1999-05-11 | 2001-04-23 | Fibrous supported polymer encapsulated electrical component |
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US09/309,429 Continuation US6263158B1 (en) | 1999-05-11 | 1999-05-11 | Fibrous supported polymer encapsulated electrical component |
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US09/840,513 Expired - Lifetime US6434328B2 (en) | 1999-05-11 | 2001-04-23 | Fibrous supported polymer encapsulated electrical component |
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2000
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- 2000-04-28 AU AU46775/00A patent/AU4677500A/en not_active Abandoned
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2001
- 2001-04-23 US US09/840,513 patent/US6434328B2/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
US6263158B1 (en) | 2001-07-17 |
AU4677500A (en) | 2000-11-21 |
WO2000068620A3 (en) | 2001-01-25 |
US6434328B2 (en) | 2002-08-13 |
WO2000068620A2 (en) | 2000-11-16 |
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