WO1987001460A1 - Test device for determination of blood in faeces - Google Patents
Test device for determination of blood in faeces Download PDFInfo
- Publication number
- WO1987001460A1 WO1987001460A1 PCT/NO1986/000060 NO8600060W WO8701460A1 WO 1987001460 A1 WO1987001460 A1 WO 1987001460A1 NO 8600060 W NO8600060 W NO 8600060W WO 8701460 A1 WO8701460 A1 WO 8701460A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- faeces
- paper
- blood
- chromogen
- peroxide
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
- G01N33/521—Single-layer analytical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/72—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood pigments, e.g. haemoglobin, bilirubin or other porphyrins; involving occult blood
- G01N33/721—Haemoglobin
- G01N33/725—Haemoglobin using peroxidative activity
Definitions
- the invention concerns a test device for determin ⁇ ation of blood in faeces.
- blood act as a catalyst in a reaction in which a colour ⁇ less chromogen is transformed to a strongly coloured com- pound when hydrogenperoxide (H Tail0_) is added to the systems, or is generated in the systems.
- H Tail0_ hydrogenperoxide
- a development of colour is interprated as positive; that blood can be present in faeces.
- heme will dissociate from hemoglobin in an acid solution and act as a pseudoperoxidase.
- Faeces is applied on a piece of paper.
- the paper may be impregnated with a chromogen (guaiacol is mostly used) or not impreg- nated.
- a chromogen guaiacol is mostly used
- H O diss ⁇ olved in an alcohol-containing solvent
- a solution containing a chromogen e.g. 3 , 3' , 5 , 5' -tetramethylbenzidine (TMB) dissolved in a strongly acid alcohol-containing solvent
- TMB a chromogen
- Common for the systems are that in the presence of blood a colour development occurs on and at the edge of the faeces.
- the hitherto described systems are constructed n such a way that the paper, with or without chromogen at the same time is carrier for the faeces.
- a carrier is here defined as a place where the faeces is stored until assay is performed.
- the systems are primarily constructed for the purpose that the patient himself applies faeces at home for later on to bring the paper to the physician or laboratory. This require that no reaction must take place between blood in the faeces and components on the paper. At hospitals the assay is mostly performed shortly after applying the sample on the paper.
- the systems described hitherto where the paper is impregnated with chromogen (guaiacol) suffer from some disadvantages.
- One of these systems is produced by Lab- systems, Helsinki, Finland, and is sold under the trade-
- Hemoccult Another of the systems with chromoge ⁇ -impregnated paper is "Hemoccult" (U.S. Patent No 3,996,006).
- One disadvan- tage in this system is that faeces cannot be stored for more than 12 days before assay must be performed.
- Chromogen-impregnated paper may give false positive react ⁇ ion when peroxidases from unboiled vegetables are present in faeces. Such peroxidases may, in sufficiently high concentrations, oxidase the chromogen to a coloured com ⁇ pound in the absence of peroxide. It has been shown ( own unpublished results) that guaiacol-based systems gave positive reaction in the presence of horse radish perox- idase without adding peroxide.
- the carrier as defined here, is peroxide-impregnated and not chromogen-impregnated one avoids the disadvantages described for the chromogen- based systems.
- the new system keeps chromogen separated from peroxide (and applied faeces) until assay is performed.
- the system allows performance of assay immediately after applying faeces, e.g. in a hospital.
- the system also allows the patient to apply the sample in his home for later on to bring the paper to physician or laboratory for assay. Own experiments show that applied samples can be stored for at least 10 weeks at room temperature before assay is performed. It will be understood that physician or laboratory shall perform the assay. Law regulations in very many co ⁇ tries makes it ineco ⁇ omical for the patient to perform the assay in his home .
- the new system thus differs from European Patent Application nr. 93595 by keeping peroxide and chromogen separate, and that the peroxide-impregnated paper first serves as carrier (storage place) for faeces, and later as analytical part of the system when chromogen is applied.
- European Patent Application 93595 is also based on a reaction in an aqueous system, while the new system employs mainly ethanol and acetic acid and very little ater. It can here be mentioned that by increasing the amount of water in test systems for determination of blood in faeces the risk increases for obtaining false positive reactions due to the presence of peroxidases from vegetables in faeces. For .
- acetic acid should not exceed 0.5 N when the concentration of sodiumperbora e is 100 g/1.
- the paper impregnated with sufficient amounts of sodiumperborate shows long stability as part of the reagents ' used for determination of blood in faeces; It can
- the test device is composed of two reagents, here ⁇ after designated Reagent A and Reagent B.
- Reagent A is an absorbing paper impregnated with a solid peroxide-contain ⁇ ing compound, here sodiumperborate. The paper serves both as a carrier for the system's peroxide and as an applicat ⁇ ion paper (storage place) for the faeces sample.
- Reagent B contains 3 , 3 ' , 5 , 5 ' -tetramethy lbenzidine (TMB) dissolved in ethy la lcoho1 , acetic acid and water. Histidine is added to the solution to stabilize TMB. (R.M. Jaffe and W . Zierdt. J Lab Clin Med. (1979) 93, 879-886).
- Reagent B is added to the faeces sample applied on Reagent "A .
- Reagent "A In the presence of blood blue-bluishgreen colour devel- opes on and at the edge of the faeces sample.
- the reaction between blood, chromogen and peroxide is very fast, e.g. a sample containing approximately 1 ml blood (with hemoglobin concentration approximately 15 g/100 ml) pr. 100 g faeces will give a distinct colour within 5-10 seconds.
- the test device is described in its simplest form, and any variation in packaging technique, especially for covering the faeces sample, will not change the principle of the test dev ice .
- Reagent B has the following prefered composition: 3 , 3' , 5, 5' -tetramethy lbenzidine 2 g/1 solution
Abstract
Faeces is applied on an absorbing paper impregnated with a solid peroxide-giving compound, here sodiumperborate. To the faeces sample is added a chromogen, 3,3',5,5'-tetramethylbenzidine, dissolved in acetic acid, ethanol and water and stabilized by adding histidine. When blood is present in the faeces sample blue-bluishgreen colour developes on and at the edge of the faeces sample. Coulor development can occur within 5-10 seconds when the sample contains 1 ml blood pr. 100 g faeces. The analytical system thus employs only one single reagent when the assay is performed because the system's peroxide-giving part is impregnated on the same carrier on to which the faeces is applied.
Description
TEST DEVICE FOR DETERMINATION OF BLOOD IN FAECES.
The invention concerns a test device for determin¬ ation of blood in faeces. Common for all systems are that blood act as a catalyst in a reaction in which a colour¬ less chromogen is transformed to a strongly coloured com- pound when hydrogenperoxide (H„0_) is added to the systems, or is generated in the systems. A development of colour is interprated as positive; that blood can be present in faeces. Common for all systems is that heme will dissociate from hemoglobin in an acid solution and act as a pseudoperoxidase.
The systems currently in use are, with few exceptions, constructed in the following way: Faeces is applied on a piece of paper. The paper may be impregnated with a chromogen (guaiacol is mostly used) or not impreg- nated. In the systems with impregnated paper H O , diss¬ olved in an alcohol-containing solvent, is applied to the paper. In the systems where the paper is not impregnated with a chromogen a solution containing a chromogen (e.g. 3 , 3' , 5 , 5' -tetramethylbenzidine (TMB) dissolved in a strongly acid alcohol-containing solvent) is added to the paper followed by adding a solution of H„0_. Common for the systems are that in the presence of blood a colour development occurs on and at the edge of the faeces.
• The hitherto described systems are constructed n such a way that the paper, with or without chromogen at the same time is carrier for the faeces. A carrier is here defined as a place where the faeces is stored until assay is performed. The systems are primarily constructed for the purpose that the patient himself applies faeces at home for later on to bring the paper to the physician or laboratory. This require that no reaction must take place between blood in the faeces and components on the paper. At hospitals the assay is mostly performed shortly after applying the sample on the paper. The systems described hitherto where the paper is impregnated with chromogen (guaiacol) suffer from some disadvantages. One of these systems is produced by Lab- systems, Helsinki, Finland, and is sold under the trade-
to*
mark "Fecatwin Sensitive". The manufacturer recommends to store the faeces on the paper for at least 2 hours before performing the assay, and claims that 72 hours storage ensures best result. The rate of positive findings is far higher when the samples are stored for 72 hours, which is confirmed by Dybdahl. (Dybdahl J.H., Studies on Occult Faecal Blood Loss, Thesis, Det medisinske fakultet, Uni- versitetet i Oslo, 1983). It is an obvious disadvantage that a test's sensitivity is dependent on the storage time of the sample, and the disadvantage is very serious when the assay may give false negative result when assay is performed shortly after applying the sample. Another of the systems with chromogeπ-impregnated paper is "Hemoccult" (U.S. Patent No 3,996,006). One disadvan- tage in this system is that faeces cannot be stored for more than 12 days before assay must be performed. Chromogen-impregnated paper may give false positive react¬ ion when peroxidases from unboiled vegetables are present in faeces. Such peroxidases may, in sufficiently high concentrations, oxidase the chromogen to a coloured com¬ pound in the absence of peroxide. It has been shown ( own unpublished results) that guaiacol-based systems gave positive reaction in the presence of horse radish perox- idase without adding peroxide. Such unwanted reactions cannot occur when faeces is stored on paper impregnated with peroxide in the absence of chromogen. Test devices where carrier is chromogen-impregnated may also autooxidase, and the production process makes it simpler to impregnate with peroxide than chromogen. The guaiacol-based systems cannot be stored at low temperature, + 4 C or lower. Distribution may therefore be a problem in the cold season.
By making a system where the carrier, as defined here, is peroxide-impregnated and not chromogen-impregnated one avoids the disadvantages described for the chromogen- based systems. The new system keeps chromogen separated from peroxide (and applied faeces) until assay is performed.
The system allows performance of assay immediately after applying faeces, e.g. in a hospital. The system also allows the patient to apply the sample in his home for later on to bring the paper to physician or laboratory for assay. Own experiments show that applied samples can be stored for at least 10 weeks at room temperature before assay is performed. It will be understood that physician or laboratory shall perform the assay. Law regulations in very many coπtries makes it inecoπomical for the patient to perform the assay in his home .
Use of solid peroxide compound is known (European Patent Application nr. 93595), and then combined with a chromogen (guaiacol) to form a single reagent package. The described reagent package seems to be constructed for depo- siting it in a toilet bowl containing faeces. Hemoglobin dissolved in the water will catalyze the reaction between chromogen and peroxide. Faeces cannot be stored on the reagent package for subsequent assay as described for the systems with chromogen-impregnated paper, and as described for the new system. The reason is that water in faeces may dissolve chromogen and peroxide causing the catalytical reaction to start.
The new system thus differs from European Patent Application nr. 93595 by keeping peroxide and chromogen separate, and that the peroxide-impregnated paper first serves as carrier (storage place) for faeces, and later as analytical part of the system when chromogen is applied. European Patent Application 93595 is also based on a reaction in an aqueous system, while the new system employs mainly ethanol and acetic acid and very little ater. It can here be mentioned that by increasing the amount of water in test systems for determination of blood in faeces the risk increases for obtaining false positive reactions due to the presence of peroxidases from vegetables in faeces. For . practica 1 purpose the new system use absorbing paper impregnated with a solid peroxide-containing compound, here sodiumperborate . In principle this is simple, but not
without problems. Experiments with differnt types of paper show that sodiumperborate is very unstable when impregnated on certain types of paper in the meaning that after a short period of time the reaction between blood and chromogen is not obtained. For those types of paper which show bad stab-' ility for sodiumperborate the problem can be solved by dissolving sodiumperborate in an aqueous solution containing organic acid, e.g. acetic acid, or a mixture of acetic acid and citric acid. By using organic acid one obtains that
10 higher concentrations of sodiumperborate can be prepared compared to an aqueous solution not .containing organic acid. The impregnation of the paper can be done in one operation using a concentrated solution of sodiumperborate containing organic acid instead of repeated impregna ions in less
15'* concentrated solutions, thus simplifying the impregnation. To ensure optimal stability of the paper impregnated with sodiumperborate the concentration of sodiumpe borate and acid must be balanced, avoiding too high concentration of acid. The ratio can be exemplified: The concentration of
20 acetic acid should not exceed 0.5 N when the concentration of sodiumperbora e is 100 g/1.
The paper impregnated with sufficient amounts of sodiumperborate shows long stability as part of the reagents' used for determination of blood in faeces; It can
25. be stored at least 12 months when refrigerated. To obtain such effect it is sufficient to impregnate the paper once in a 100 g/1 sodiumperborate solution containing organic acid. An alternative way to impregnate the paper is to use less concentrated solutions of sodiumperborate without
30 organic acid, with repeated impregnations and drying. This alternative can be used using paper types showing sufficient stability of sodiumperborate in the absence of organic acid.
35r;
Description of the test device.
The test device is composed of two reagents, here¬ after designated Reagent A and Reagent B. Reagent A is an absorbing paper impregnated with a solid peroxide-contain¬ ing compound, here sodiumperborate. The paper serves both as a carrier for the system's peroxide and as an applicat¬ ion paper (storage place) for the faeces sample. Reagent B contains 3 , 3 ' , 5 , 5 ' -tetramethy lbenzidine (TMB) dissolved in ethy la lcoho1 , acetic acid and water. Histidine is added to the solution to stabilize TMB. (R.M. Jaffe and W . Zierdt. J Lab Clin Med. (1979) 93, 879-886).
Reagent B is added to the faeces sample applied on Reagent "A . In the presence of blood blue-bluishgreen colour devel- opes on and at the edge of the faeces sample. The reaction between blood, chromogen and peroxide is very fast, e.g. a sample containing approximately 1 ml blood (with hemoglobin concentration approximately 15 g/100 ml) pr. 100 g faeces will give a distinct colour within 5-10 seconds. The test device is described in its simplest form, and any variation in packaging technique, especially for covering the faeces sample, will not change the principle of the test dev ice .
Table 1. Composition of the test device
Reagent A has the following prefered composition: A piece of filter paper is dipped in a solution of sodiumperborate, - 100 g/1, containing acetic acid up to 0.5 N. A mixture of acetic acid and citric acid can be used instead of acetic acid alone: Normality acetic acid :Normality citric acid= 3:1, with maximum acid concentration 0.5 N. Alternatively, the paper can be impregnated in less concentrated sαdium- perborate solutions without organic acids, with repeated impregnations and drying.
Reagent B has the following prefered composition: 3 , 3' , 5, 5' -tetramethy lbenzidine 2 g/1 solution
Ethylalcohol 500 ml/1 solution - Acetic acid 350 ml/l solution
Water 150 ml/1 solution
Histidine 4 g/1 solution
Claims
1. Test device for determination of blood in faeces composed of two separated reagents; a filter paper 5 impregnated with solid peroxide, her by dipping the paper in a solution of sodiumperborate with concentration equivalent to 60-120 g/1, and a liquid reagent containing a chromogen ( 3 , 3 ' , , 5 ' -tetramethylbenzidine (1-3 g/1) dissolved in ethano 1 : acetic acid:water= 5:3.5:1.5, containing
10 histidine (4g/l), c h a r a c t e r i z e d b y that peroxide and chromogen are separated, and that the faeces sample is applied to the peroxide-impregnated filter paper and can be stored there until the assay is performed by adding the chromogen to the filter paper containing faeces
15 and peroxide whereby colour developes in the presence of blood .
20
2.5
30
35
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK180587A DK180587A (en) | 1985-08-30 | 1987-04-09 | TEST EQUIPMENT FOR DETERMINING BLOOD IN FAECES |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO853413A NO157437C (en) | 1985-08-30 | 1985-08-30 | TESTING DEVICE FOR DETERMINING BLOOD IN FAECES. |
NO853413 | 1985-08-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1987001460A1 true WO1987001460A1 (en) | 1987-03-12 |
Family
ID=19888455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1986/000060 WO1987001460A1 (en) | 1985-08-30 | 1986-08-26 | Test device for determination of blood in faeces |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0235241A1 (en) |
AU (1) | AU6286186A (en) |
DK (1) | DK180587A (en) |
NO (1) | NO157437C (en) |
WO (1) | WO1987001460A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4673654A (en) * | 1985-10-31 | 1987-06-16 | Warner-Lambert Company | Composition for determining peroxidase-like activity of hemoglobin |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3092463A (en) * | 1959-11-02 | 1963-06-04 | Miles Lab | Stable blood detecting composition |
GB981955A (en) * | 1961-05-04 | 1965-02-03 | Miles Lab | Improvements in or relating to diagnostic compositions |
US3996006A (en) * | 1974-08-16 | 1976-12-07 | Smithkline Corporation | Specimen test slide |
SE408489B (en) * | 1974-10-16 | 1979-06-11 | Lachema Np | DIAGNOSTIC TEST STRIP FOR DETERMINATION OF BLOOD AND HEMOGLOBIN IN BIOLOGICAL MATERIALS |
EP0030388A2 (en) * | 1979-12-10 | 1981-06-17 | Baylor College of Medicine | Methods for detecting and quantifying occult blood in a human specimen |
US4333734A (en) * | 1980-01-18 | 1982-06-08 | Sloan-Kettering Institute For Cancer Research | Diagnostic device for fecal occult blood and method of use |
EP0093595A1 (en) * | 1982-04-30 | 1983-11-09 | Hematec Corporation | Home diagnostic aid and method for determining the presence of occult blood |
US4511533A (en) * | 1982-10-07 | 1985-04-16 | Helena Laboratories Corporation | Test kit for performing a medical test |
US4582685A (en) * | 1982-10-07 | 1986-04-15 | Helena Laboratories Corporation | Test kit for performing a medical test |
-
1985
- 1985-08-30 NO NO853413A patent/NO157437C/en unknown
-
1986
- 1986-08-26 EP EP86905443A patent/EP0235241A1/en not_active Withdrawn
- 1986-08-26 WO PCT/NO1986/000060 patent/WO1987001460A1/en not_active Application Discontinuation
- 1986-08-26 AU AU62861/86A patent/AU6286186A/en not_active Abandoned
-
1987
- 1987-04-09 DK DK180587A patent/DK180587A/en not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3092463A (en) * | 1959-11-02 | 1963-06-04 | Miles Lab | Stable blood detecting composition |
GB981955A (en) * | 1961-05-04 | 1965-02-03 | Miles Lab | Improvements in or relating to diagnostic compositions |
US3252762A (en) * | 1961-05-04 | 1966-05-24 | Miles Lab | Stabilized occult blood diagnostic |
US3996006A (en) * | 1974-08-16 | 1976-12-07 | Smithkline Corporation | Specimen test slide |
SE408489B (en) * | 1974-10-16 | 1979-06-11 | Lachema Np | DIAGNOSTIC TEST STRIP FOR DETERMINATION OF BLOOD AND HEMOGLOBIN IN BIOLOGICAL MATERIALS |
EP0030388A2 (en) * | 1979-12-10 | 1981-06-17 | Baylor College of Medicine | Methods for detecting and quantifying occult blood in a human specimen |
US4333734A (en) * | 1980-01-18 | 1982-06-08 | Sloan-Kettering Institute For Cancer Research | Diagnostic device for fecal occult blood and method of use |
EP0093595A1 (en) * | 1982-04-30 | 1983-11-09 | Hematec Corporation | Home diagnostic aid and method for determining the presence of occult blood |
US4511533A (en) * | 1982-10-07 | 1985-04-16 | Helena Laboratories Corporation | Test kit for performing a medical test |
US4582685A (en) * | 1982-10-07 | 1986-04-15 | Helena Laboratories Corporation | Test kit for performing a medical test |
Also Published As
Publication number | Publication date |
---|---|
NO157437B (en) | 1987-12-07 |
DK180587D0 (en) | 1987-04-09 |
NO853413L (en) | 1987-03-02 |
DK180587A (en) | 1987-04-09 |
AU6286186A (en) | 1987-03-24 |
EP0235241A1 (en) | 1987-09-09 |
NO157437C (en) | 1988-03-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0041188B1 (en) | Interference-resistant composition, device, method of preparing it and method for determining a peroxidatively active substance in a test sample | |
Lundquist | The determination of ethyl alcohol in blood and tissues | |
FI77894B (en) | FOERFARANDE FOER FRAMSTAELLNING AV ETT ANALYTISKT ELEMENT FOER BESTAEMNING AV GLUKOS I HOEG KONSENTRATION. | |
US6998248B2 (en) | Reagent test strip for analyte determination having a hemolyzing agent | |
EP0123115B1 (en) | Ascorbate interference-resistant composition, device and method for the determination of peroxidatively active substances | |
CA2295617C (en) | Method, composition and device for the determination of free halogens in aqueous fluids | |
EP0030684A1 (en) | Test composition for peroxidatively active substances, test device containing the composition, process for preparing same and method for the determination of peroxidatively active substances | |
EP0030682B1 (en) | Test composition for peroxidatively active substances, test device containing the composition, process for preparing same and method for the determination of peroxidatively active substances | |
EP0555045A1 (en) | Improved oxidative coupling dye for spectrophotometric quantitative analysis of analytes | |
US4673654A (en) | Composition for determining peroxidase-like activity of hemoglobin | |
HU224897B1 (en) | Visually-readable reagent test strip | |
US4071318A (en) | Test composition and device for determining peroxidatively active substances | |
US4642286A (en) | Composition and method for ethanol determination | |
DK156730B (en) | TEST COMPOSITION AND MATERIALS FOR DETERMINING THE EXISTENCE OF GLUCOSE IN A LIQUID SAMPLE AND PROCEDURE FOR SEMIQUANTITATIVE DETERMINATION OF GLUCOSE IN URINE | |
JPH01197653A (en) | Method and reagent for analyzing peracid | |
US4786596A (en) | Method of preparing a test strip for alcohol testing | |
EP0036543A1 (en) | Improved method and device for the semiquantitative determination of glucose in aqueous fluids and method of preparing the device | |
US4251222A (en) | Sensitizers for peroxidative activity tests | |
CA1144050A (en) | Bilirubin-resistant determination of uric acid and cholesterol | |
JPH0146029B2 (en) | ||
CS226718B2 (en) | Composition for removing ascorbic acid from aqueous liquid substances | |
JP2950592B2 (en) | Multilayer analytical tool for fructosamine measurement | |
WO1987001460A1 (en) | Test device for determination of blood in faeces | |
EP0158964A2 (en) | Tester for detecting a substance in a body fluid | |
CA1134247A (en) | Bilirubin-resistant determination of uric acid |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU DK FI JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1986905443 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1986905443 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1986905443 Country of ref document: EP |