Patent US4837043A successfully refreshed from Google Patents.
US4837043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of test strips by casting method
Assignee: Bayer Corp
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Filing: 1987-04-06
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Granted: 1989-06-06
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Expires: 2007-04-06
Abstract
Abstract Process for the production of a test devices using extruder casting machines or cascade casting machines is disclosed in which reagent zones are produced on a common surface with remaining portion of test device such that reagent zone is protected by being in the same plane as a portion of the test device. The process permits application of reagent material to matrix areas without interaction of the reagents or the loss of reagents due to extraction during the process of forming the test device.
Inventors
- 👤 Helmut Engelmann
- 👤 Karlheinz Hildenbrand
- 👤 Gunter Junkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/46; D21H5/00; D21H5/0005; D21H5/0042; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A process for the preparation of a diagnostic test strip, which process comprises (a) adhering a matrix to a substrate, (b) impregnating the matrix with an impregnating liquid having a viscosity of 0.9 to 4 mPas using an extruder casting machine or a cascade casting machine for the impregnation, and (c) slitting the resulting reagent impregnated matrix into individual diagnostic test strips.
Claim 2
Dependent Claim
62 words
A process for the preparation of a diagnostic test strip, which process comprises (a) adhering a matrix to a substrate, (b) impregnating the matrix with an impregnating liquid having a viscosity of 0.9 to 4 mPas using an extruder casting machine or a cascade casting machine for the impregnation, and (c) slitting the resulting reagent impregnated matrix into individual diagnostic test strips.
Claim 3
Dependent Claim
17 words
The process according to claim 1 in which the impregnating liquid is a solution, dispersion or emulsion.
Claim 4
Dependent Claim
22 words
The process according to claim 1 in which the impregnating liquid contains reagents for the detection of analytes in a body fluid.
Claim 5
Dependent Claim
19 words
The process according to claim 3 in which the reagents are enzymes, antibodies, antigens, coenzymes, enzyme substrates or indicators.
Claim 6
Dependent Claim
20 words
The process according to claim 1 in which the matrix is paper or a polymer of natural or synthetic origin.
Claim 7
Dependent Claim
14 words
The process according to claim 5 in which the matrix is a microporous polymer.
Claim 8
Dependent Claim
12 words
The process according to claim 6 in which the matrix is gelatin.
Claim 9
Dependent Claim
18 words
The process according to claim 1 in which multiple layers of impregnating liquid are applied to the matrix.
Claim 10
Dependent Claim
19 words
The process according to claim 8 in which the multiple layers include a protective layer and a reagent layer.
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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |