US3705276A - Keyboard switch assembly with conductive plastic contactor and actuator spring sleeve biasing means - Google Patents
Keyboard switch assembly with conductive plastic contactor and actuator spring sleeve biasing means Download PDFInfo
- Publication number
- US3705276A US3705276A US145212A US3705276DA US3705276A US 3705276 A US3705276 A US 3705276A US 145212 A US145212 A US 145212A US 3705276D A US3705276D A US 3705276DA US 3705276 A US3705276 A US 3705276A
- Authority
- US
- United States
- Prior art keywords
- contactor
- key
- conductive plastic
- stem
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/785—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/029—Composite material comprising conducting material dispersed in an elastic support or binding material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2201/00—Contacts
- H01H2201/022—Material
- H01H2201/032—Conductive polymer; Rubber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/006—Only mechanical function
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/024—Transmission element
- H01H2221/026—Guiding or lubricating nylon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/002—Casings sealed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/034—Bezel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/026—Internal encoding, e.g. validity bit
Definitions
- CONDUCTIVE PLAS'TIC g METAL FILLED
- FIGS I the key which was depressed.
- This invention is'directed to a new and improved encoded switch array or keyboard structure for converting key or button depressions to a coded electrical output. More particularly this invention is directed to a new and improved encoder switch array in which conductive contactors are used to engage electrical contacts in order to generate a coded electrical output.
- keyboardtype encoders have comprised a plurality of keys which when depressed close one or more electrical connectors to generate electrical signals.
- Various types of mechanical switches have been used for this purpose, most of which have relied upon metal to metal contact for completing the electrical circuits.
- the generated electrical signals are then usually converted using some type of external logic, ('e.g. diode logic) to generate a-code representative of Such encoders of" the prior arthave generally been quite costly to construct andaccordingly any equipment using prior art encoders has beenquite costly.
- the switch of this invention is preferably of the pushbutton type which preferably incorporates a conductive contactor having a hole therethrough in which there is positioned a first resilient biasing means to hold it above electrical contacts positioned on a board and a second resilient biasing adapted to engage the contactor above the first resilient biasing adapted means to cause said contactor to be forced against the contacts.
- the new and improved switch uses a conductive elastomer as the contactor, said conductive elastomer exhibiting less than a 1 ohm per cubic centimeter change inresistance in milacontactor comprising a conductive plastic incorporating metal particlesas the conductive material versus a I contactor comprising a conductive plastic incorporating carbon black as the conductive material.
- FIGS. 16 shows the preferred construction of'the coded switch array of this invention.
- the encoded switch array is shown generally atl0 and includes an outer frame 11 as for example, of plastic.
- a plurality of keys 12 forming a keyboard.
- the keys may have numbers, letters or other indicia thereon as per conventional keyboards.
- Each of the keys 12 of this invention are provided with a key stem 13 and a guide pinl4.
- the keys 12 may be constructed of plastic, (e.g.v nylon, polypropyle'ne),'or metal. I
- circuit board used in the encoder of this invention.
- the circuit board e.g. of plastic, eg. Formica, Bakelite
- electrical circuit pattern 16 elg. of copper plate thereon conventional in the art
- the circuit pattern shown is adapted to provide output signals from twelve connector pins coupled thereto as shown at 17, each pin providing an indication of the depression of one or more keys.
- the odd or thirthteenth pin shown at 18 isused as a common'to which I power may be applied or which may be grounded to complete a circuit.
- the circuit patternassociated with each key comprises a plurality of spokes 19 on either side ,of holes 20 through which the stems of the key extend.
- holes 21 are provided for the passage of the key guide pins I4.
- the circuit board additionally is provided with holes 22 to permit pins 23 I of the frame 11 to extend therethrough (see FIG. 5).
- the conductive elastomer used preferably has a resistivity less than 0.01 ohm centimeters.
- FIG. 1 is atop view partially broken away showing the encoded switch array according to the invention
- FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;
- FIG. 3 is a top view of a circuit board suitable for use
- FIG. 4 is a bottom view of the encoded switch array with .parts broken away to show the bottom of the circuit board shown in FIG. 3;
- FIG. 5 is a sectional view taken along line 55 of FIG. 4;
- FIG. 6 is a perspective view showing one key and the parts cooperating with it as incorporated in the encoded switch array'of the invention.
- FIG. 7 is a view of the preferred form of the contactor of this invention in engagement with thewiring'pattern of the circuit board shown in FIG. 3;
- FIGS. 2,4,5 and 6 there is shown a back plate (e.g. of plastic) for holding the board 15 and the other parts of the switch not yetdescribed together.
- the back plate is provided bores 26 into which pins 14 are adapted to extend.
- plate 25 includes bores 27 in which the stems 13 are adapted to slide up and down upon depression and then release of the keys 12. To retain the stems 13 within the bores 27, the stems are provided with heads 13a as shown in FIG. 2.
- each spring 30 is constructed such that the lower portion 30a thereof rests against the side walls of the bore and the top portion 30b thereof extends above the bores 29 through the holes 19 of the board 15.
- the spring 30 is most preferably of the Belleville type (in the nature of a drain plunger) to impart the sensation that the key has been fully depressed. With this type of spring upon depression of a key a snap action or toggle is felt by the finger as spring portion 30a tends to try to invert about spring portion 30b.
- the spring 30 is preferably made of plastic material such as polyethylene, polypropylene or silicone rubber. It should be understood that other types of springs although less preferable may be used to perform the function of spring 30 as for example, metal coil springs and the like whether or not they provide the preferred snap action.
- each of the spring portion 30b there -is provided a contactor 35.
- the contactors are in the shape of a cylinder havinga central bore 36 through which the stem 13 is adapted to move throughas a key 12 is depressed.
- the contactor 35 is preferably comprised of a plastic material and most preferably a conformable and resilent plastic material which is adapted to conform to the shape of the surface of the wiring pattern contacts on the circuit board 15 to insure good contact.
- the plastic material is most preferably filled with metal particles such as silver, copper, gold, etc., or any combination thereof which exhibit good conductive properties.
- the conductive particles may be carbon-black, although the use of carbonblack particles in switch applicators is much less desirable because of the substantial change in the resistance of such particles'upon application of pressure to the particles (e.g. upon depression of the key 12).
- the contactor may be constructed of solid metal as for example, silver, copper," tin foil, although the use of solid metal contactors in lieu of a resilent and comformable plastic is significantly less desirable because of bounce problems which ensue as well as the lack of consistently good contact.
- the contactor is constructed of plastic materials containing l to 80 volume percent of metal particles (e.g. silicone rubber filled with -silver flake).
- metal particles e.g. silicone rubber filled with -silver flake.
- Examples of other conductive plastics suitable for use in this invention are further disclosed in US. Pats. No-.- 3,1 40,342'and No. 3,576,387.
- the preferred contactor 35 of this invention is a conductive plastic which has a volume resistivity less than 0.01 ohm centimeters so that is is of low resistance.
- the conductive plastic exhibits less than a 1 ohm per cm change in resistance in microseconds when under pressure applied by key depression. This has been accomplished in this invention by using as heretofore mentionedthe preferred conductive plastic comprising a conformable plastic material (e.g. silicone rubber or the like) filled with metal particles, (e.g. silver) in the amount of i0 to 80 volume percent.
- the array also includes a dust cover 39 such as of paper, polyethylene film or the like.
- the dust cover 39 is provided with holes therein at 39a and 39b for permitting the movement of the stem 13 and the pin 14 therethrough.
- the spring portion 41b then returns to its original configuration and urges the key upwardly.
- the spring 41 is preferably constructed of the same material as the spring 30.
- one or more keys 12 of the array are depressed.
- the depression of a key causes the pin 14 and stem l3to move downwardly.
- the stem shoulder 13a (FIG. 2) engages the spring portion 30b while at the same time moving spring 41 downwardly.
- springs 30 and 41 are depressed. Further depression produces a toggle or snap action touch in the finger of the individual depressing the key as the spring 41 trys to invert uponitself. At this'point the individual using the device knows that the key may be released because contact has been made.
- FIG. 8 there is shown a graph comparing the response produced by the preferred conductive plastic contactor of this invention, that is one filled with highly conductive metal particles versus a usable conductive plastic contactor containing carbon black particles as the conductive'material therein when both are used in series with a source voltage and a resistance in series with the source and the switch.
- the preferred contactors of this invention should exhibit less than a l ohm Per cm absolute change in resistance with pressure to meet the rise time requirements of presently used circuits. When contactors are made with this property, it has been found that the properties of the switch are such that they are compatible for use with fast rise time semiconductor devices.
- the preferred contactors may also be of the materials disclosed and described in [1.8.
- a switch comprising a key, a key stem extending therefrom, a first spring positioned below said key and about said stem, a contactor positioned and movable about said stem, a member having a hole therethrough for the passage of the stem, said member positioned below said contactor and said member having at least two electrical contacts about said hole, support means positioned below said member for slidably supporting the stem therein, and a second spring positioned on the support means and having a portion extending through said hole to-maintain said contactor above said contacts.
- a switch according to claim 7 in which the conductive plastic exhibits less than a 1 ohm per cm change in resistance with pressure applied thereto by key depression.
- An encoded switch array comprising a circuit board having a plurality of holes formed therethrough, electrical contacts supported by and positioned about A at least some of said holes of said circuit board, a base plate having a plurality of bores in alignment with the plurality of holes having the electrical contacts positioned about them, a plurality of keys, key stems attached to said keys and extending through said holes having contacts positioned about them, a contactor positioned about each of the stems and adapted to move about said stems, first means for holding each of said contactors above said contacts, second means for pressing each of said contactors against said contacts upon the depression of said keys, said circuit board havinga wiring pattern thereon coupled to said electrical contacts, and each stem adapted to slidably move within a different one of said bores, and wherein said first means comprises a plurality of springs which are positioned on said base plate and which have a portion which extends through said holes in said boardto-hold said contactors above said electrical contacts.
- said second means comprising a plurality of springs each having a portion positioned to press said contactor against said contacts and wherein the springs of each plurality of springs are constructed to force the keys back to their original position after they are released following de ression.
- a swi ch comprising a circuit board having at least one electrically conductive contact provided on one surface thereof, a conductive plastic contactor for electrically engaging said contact, first plastic insulator means extending between the contact and theconductive plastic contactor for positioning the conductive plastic'contactor out of engagement with said contact, depressible key means supported by'the board for forcing said contactor to engage said contact, insulator cover means positioned in physical contact with said contactor and spring means positioned in physical con tact with said cover means and-said key means to provide resistance to key means depression.
- a switch comprising a key, a key stem extending therefrom, a first spring positioned below said key and about said stem, a member having a hole therethrough for the passage of the stem, said member positioned below said contactor and said member having electrical contact means about said hole, support means positioned below said member for slidably supporting the stem therein, and a second spring positioned on the support means and having a portion extending through said hole to maintain said contactor above said contact means.
Abstract
Description
Claims (16)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14521271A | 1971-05-20 | 1971-05-20 |
Publications (1)
Publication Number | Publication Date |
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US3705276A true US3705276A (en) | 1972-12-05 |
Family
ID=22512082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US145212A Expired - Lifetime US3705276A (en) | 1971-05-20 | 1971-05-20 | Keyboard switch assembly with conductive plastic contactor and actuator spring sleeve biasing means |
Country Status (1)
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US (1) | US3705276A (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789167A (en) * | 1972-12-20 | 1974-01-29 | Chomerics Inc | Multi-output level keyboard switch assembly with improved operator and contact structure |
US3806685A (en) * | 1972-10-04 | 1974-04-23 | Chromerics Inc | Linear cam slide switch with guide means and conductive sheet contact |
US3819895A (en) * | 1972-10-04 | 1974-06-25 | Lectradate Inc | Electronic momentary switch |
US3862381A (en) * | 1973-10-29 | 1975-01-21 | Chomerics Inc | Keyboard switch assembly with multilayer, coextensive contactor means |
US3862382A (en) * | 1973-10-29 | 1975-01-21 | Chomerics Inc | Keyboards switch assembly with multilayer pattern contact means |
US3916360A (en) * | 1974-08-09 | 1975-10-28 | Singer Co | Magnetic keyboard |
US3928741A (en) * | 1974-09-16 | 1975-12-23 | Texas Instruments Inc | Momentary contact single pole switch |
JPS5140769U (en) * | 1974-09-20 | 1976-03-26 | ||
FR2358000A1 (en) * | 1976-07-08 | 1978-02-03 | Bowmar Instrument Corp | LUMINOUS PUSH-BUTTON SWITCH |
US4127752A (en) * | 1977-10-13 | 1978-11-28 | Sheldahl, Inc. | Tactile touch switch panel |
US4181964A (en) * | 1975-07-02 | 1980-01-01 | Texas Instruments Incorporated | Integrated electronics assembly on a plastic chassis |
USRE30435E (en) * | 1973-02-23 | 1980-11-11 | Brother Kogyo Kabushiki Kaisha | Keyboard switch arrangement and key switch useable therein |
US4243852A (en) * | 1979-04-16 | 1981-01-06 | Oak Industries Inc. | Membrane switch with means for impeding silver migration |
EP0068133A2 (en) * | 1981-06-12 | 1983-01-05 | Wilhelm Ruf KG | Switch disposition with an elastic switch element |
US4439649A (en) * | 1982-08-30 | 1984-03-27 | Suncom, Incorporated | Joy stick switch |
US4440999A (en) * | 1982-08-13 | 1984-04-03 | Press On, Inc. | Membrane switch |
US4471177A (en) * | 1982-08-13 | 1984-09-11 | Press On, Inc. | Enlarged switch area membrane switch and method |
US4877347A (en) * | 1987-07-09 | 1989-10-31 | Ta Triumph-Adler Aktiengesellschaft | Keyboard for typewriters or similar machines |
US20160293355A1 (en) * | 2015-03-31 | 2016-10-06 | Brother Kogyo Kabushiki Kaisha | Key Input Device, Method of Manufacturing the Same, and Image Recording Apparatus |
CN108172441A (en) * | 2016-12-07 | 2018-06-15 | 原相科技股份有限公司 | The general-purpose circuit board of mechanical key and optical profile type button can be compatible with |
US10147561B2 (en) * | 2016-11-29 | 2018-12-04 | Pixart Imaging Inc. | Universal circuit board for mechanical keyswitch and optical keyswitch |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2848920A (en) * | 1955-03-02 | 1958-08-26 | John M Lester | Key contact system for electronic organs |
US2867043A (en) * | 1952-10-16 | 1959-01-06 | Applic Electroniques Des Caout | Variable electric resistance semiconductor devices |
US2931877A (en) * | 1958-02-20 | 1960-04-05 | Edward J Henley | Electrical contact device |
US3080457A (en) * | 1958-11-03 | 1963-03-05 | Ericsson Telefon Ab L M | Multiple switching device for automatic telephone systems |
US3210484A (en) * | 1962-04-20 | 1965-10-05 | Automatic Elect Lab | Push button device |
US3229053A (en) * | 1962-10-15 | 1966-01-11 | Rca Corp | Printed circuit push button switch device with cam follower contact actuating structure |
US3363076A (en) * | 1967-02-20 | 1968-01-09 | Nippon Musical Instruments Mfg | Electric switch provided with a stationary electroconductive rubber contact |
US3369097A (en) * | 1966-04-30 | 1968-02-13 | Nippon Musical Instruments Mfg | Contact device for electric switches |
-
1971
- 1971-05-20 US US145212A patent/US3705276A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2867043A (en) * | 1952-10-16 | 1959-01-06 | Applic Electroniques Des Caout | Variable electric resistance semiconductor devices |
US2848920A (en) * | 1955-03-02 | 1958-08-26 | John M Lester | Key contact system for electronic organs |
US2931877A (en) * | 1958-02-20 | 1960-04-05 | Edward J Henley | Electrical contact device |
US3080457A (en) * | 1958-11-03 | 1963-03-05 | Ericsson Telefon Ab L M | Multiple switching device for automatic telephone systems |
US3210484A (en) * | 1962-04-20 | 1965-10-05 | Automatic Elect Lab | Push button device |
US3229053A (en) * | 1962-10-15 | 1966-01-11 | Rca Corp | Printed circuit push button switch device with cam follower contact actuating structure |
US3369097A (en) * | 1966-04-30 | 1968-02-13 | Nippon Musical Instruments Mfg | Contact device for electric switches |
US3363076A (en) * | 1967-02-20 | 1968-01-09 | Nippon Musical Instruments Mfg | Electric switch provided with a stationary electroconductive rubber contact |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806685A (en) * | 1972-10-04 | 1974-04-23 | Chromerics Inc | Linear cam slide switch with guide means and conductive sheet contact |
US3819895A (en) * | 1972-10-04 | 1974-06-25 | Lectradate Inc | Electronic momentary switch |
US3789167A (en) * | 1972-12-20 | 1974-01-29 | Chomerics Inc | Multi-output level keyboard switch assembly with improved operator and contact structure |
USRE30435E (en) * | 1973-02-23 | 1980-11-11 | Brother Kogyo Kabushiki Kaisha | Keyboard switch arrangement and key switch useable therein |
US3862381A (en) * | 1973-10-29 | 1975-01-21 | Chomerics Inc | Keyboard switch assembly with multilayer, coextensive contactor means |
US3862382A (en) * | 1973-10-29 | 1975-01-21 | Chomerics Inc | Keyboards switch assembly with multilayer pattern contact means |
US3916360A (en) * | 1974-08-09 | 1975-10-28 | Singer Co | Magnetic keyboard |
US3928741A (en) * | 1974-09-16 | 1975-12-23 | Texas Instruments Inc | Momentary contact single pole switch |
JPS5140769U (en) * | 1974-09-20 | 1976-03-26 | ||
US4181964A (en) * | 1975-07-02 | 1980-01-01 | Texas Instruments Incorporated | Integrated electronics assembly on a plastic chassis |
FR2358000A1 (en) * | 1976-07-08 | 1978-02-03 | Bowmar Instrument Corp | LUMINOUS PUSH-BUTTON SWITCH |
US4127752A (en) * | 1977-10-13 | 1978-11-28 | Sheldahl, Inc. | Tactile touch switch panel |
US4243852A (en) * | 1979-04-16 | 1981-01-06 | Oak Industries Inc. | Membrane switch with means for impeding silver migration |
EP0068133A2 (en) * | 1981-06-12 | 1983-01-05 | Wilhelm Ruf KG | Switch disposition with an elastic switch element |
EP0068133A3 (en) * | 1981-06-12 | 1983-03-30 | Wilhelm Ruf Kg | Switch disposition with an elastic switch element |
US4440999A (en) * | 1982-08-13 | 1984-04-03 | Press On, Inc. | Membrane switch |
US4471177A (en) * | 1982-08-13 | 1984-09-11 | Press On, Inc. | Enlarged switch area membrane switch and method |
US4439649A (en) * | 1982-08-30 | 1984-03-27 | Suncom, Incorporated | Joy stick switch |
US4877347A (en) * | 1987-07-09 | 1989-10-31 | Ta Triumph-Adler Aktiengesellschaft | Keyboard for typewriters or similar machines |
US20160293355A1 (en) * | 2015-03-31 | 2016-10-06 | Brother Kogyo Kabushiki Kaisha | Key Input Device, Method of Manufacturing the Same, and Image Recording Apparatus |
US9704669B2 (en) * | 2015-03-31 | 2017-07-11 | Brother Kogyo Kabushiki Kaisha | Key input device for multifunction peripheral equipment |
US10147561B2 (en) * | 2016-11-29 | 2018-12-04 | Pixart Imaging Inc. | Universal circuit board for mechanical keyswitch and optical keyswitch |
CN108172441A (en) * | 2016-12-07 | 2018-06-15 | 原相科技股份有限公司 | The general-purpose circuit board of mechanical key and optical profile type button can be compatible with |
CN108172441B (en) * | 2016-12-07 | 2019-05-31 | 原相科技股份有限公司 | The general-purpose circuit board of mechanical key Yu optical profile type key can be compatible with |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AMP INCORPORATED, HARRISBURG, PA., 17105, A CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHOMERICS, INC.;REEL/FRAME:003854/0523 Effective date: 19810511 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
AS | Assignment |
Owner name: LUCAS DURALITH AKT CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:AMP KEYBOARD TECHNOLOGIES INC.;REEL/FRAME:005258/0527 Effective date: 19890428 Owner name: AMP KEYBOARD TECHNOLOGIES, INC., A WHOLLY OWNED SU Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMP INCORPORATED;REEL/FRAME:005258/0518 Effective date: 19890418 |