Patent US4824640A successfully refreshed from Google Patents.
US4824640A
Expired / Lapsed
US
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Transparent test strip system
Assignee: Bayer AG
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Filing: 1986-10-27
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Granted: 1989-04-25
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Expires: 2006-10-27
Abstract
Abstract A transparent reagent carrier layers in analytical agents for dry chemical detection of constituents of aqueous sample solutions, the reagent carrier layer consisting of a water-soluble or water-swellable component and a film-forming component.
Inventors
- 👤 Karlheinz Hildenbrand
- 👤 Hans-Hagen von Dohren
- 👤 Hermann Perrey
- 👤 Klaus Wehling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:14
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521; G01N21/00; G01N21/75; G01N21/77
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A transparent reagent carrier layer for an analytical agent for dry chemical detection of constituents of aqueous sample solutions, comprising within one layer a water-soluble or water-swellable component selected from the group consisting of a polyacrylamide, a polyacrylic acid, cellulose ether, polyethyleneimine, polyvinyl alcohol, a copolymer of vinyl alcohol and vinyl acetate, gelatine, agarose, alginate and polyvinyl pyrrolidone, and an essentially water-insoluble film-forming component selected from the group consisting of a polystyrenesulfonic acid, a cellulose ester, a polyvinyl acetate, a polyamide, a polycarbonate, a polyether-carbonate, a ionic polyurethane, a non-ionic polyurethane, mixtures thereof and copolymers thereof.
Claim 2
Dependent Claim
96 words
A transparent reagent carrier layer for an analytical agent for dry chemical detection of constituents of aqueous sample solutions, comprising within one layer a water-soluble or water-swellable component selected from the group consisting of a polyacrylamide, a polyacrylic acid, cellulose ether, polyethyleneimine, polyvinyl alcohol, a copolymer of vinyl alcohol and vinyl acetate, gelatine, agarose, alginate and polyvinyl pyrrolidone, and an essentially water-insoluble film-forming component selected from the group consisting of a polystyrenesulfonic acid, a cellulose ester, a polyvinyl acetate, a polyamide, a polycarbonate, a polyether-carbonate, a ionic polyurethane, a non-ionic polyurethane, mixtures thereof and copolymers thereof.
Claim 3
Dependent Claim
38 words
A reagent carrier layer according to claim 1, wherein the film-forming component is an ionic polyurethane having one or more ionic radicals selected from the group consisting of a sulphonate group, a carboxylate group and an ammonium group.
Claim 4
Dependent Claim
29 words
A reagent carrier layer according to claim 1, wherein the weight of the film-forming component to the water-soluble or water-swellable component is the range from 50:1 down to 1:1.
Claim 5
Dependent Claim
21 words
A reagent carrier layer according to claim 3, wherein the weight ratio is in the range from 10:1 down to 5:1.
Claim 6
Dependent Claim
59 words
A process for the preparation of a reagent carrier layer according to claim 1, the process comprising mixing a solution or dispersion of one or more of the film-forming components and a solution or dispersion of one or more of the water-soluble or water-swellable components, applying the resultant mixture to a carrier and drying said mixture on said carrier.
Claim 7
Dependent Claim
35 words
A process according to claim 5, wherein the solvents or diluents used for the preparation of the solutions or dispersions of the film-forming component and the water-soluble or water-swellable component are miscible with one another.
Claim 8
Dependent Claim
39 words
A process according to claim 5, wherein the same solvent or diluent used for the preparation of the solution or dispersion of the water-soluble or water-swellable component is used to prepare the solution or dispersion of the film-forming component.
Claim 9
Dependent Claim
12 words
A process according to claim 5, wherein the carrier is polyethylene terephthalate.
Claim 10
Dependent Claim
36 words
An analytical agent for dry chemical detection of constituents of an aqueous sample solution comprising a reagent carrier according to claim 1 and one or more detection reagents for determination of the constituents to be detected.
Claim 11
Dependent Claim
34 words
A method for the dry chemical detection of constituents of an aqueous sample solution comprising bringing the sample solution into contact with an analytical agent according to claim 9 and monitoring resultant detection reaction.
Claim 12
Dependent Claim
15 words
A method according to claim 10, wherein the detection reaction is monitored by transmission photometry.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |