Patent US4820489A successfully refreshed from Google Patents.
US4820489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test strips and a process for the production thereof
Assignee: Roche Diagnostics GmbH
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Filing: 1986-07-09
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Granted: 1989-04-11
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Expires: 2006-07-09
Abstract
Abstract A test strip has a reagent-containing film layer coatingly embedded at least preponderantly on and into only one side of a carrier layer made of a multifilar fabric or fleece.
Inventors
- 👤 Anselm Rothe
- 👤 Wolfgang-Reinhold Knappe
- 👤 Heinz-Friedrich Trasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:04
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A test strip made by a process which comprises: providing a carrier layer having an upper side and a lower side and being made of one of a multifilar fabric or fleece; applying and thereafter drying a coating mass of one of a suspension or dispersion of at least one synthetic resin in a solvent as a layer on the carrier layer so that most of the coating mass remains on the upper side of the carrier layer to obtain a fabric or fleece coated with a film layer of said coating mass wherein said film layer is coatingly embedded at least preponderantly on and into only one side of the carrier layer; and introducing at least one reagent by at least one of admixing with the resin before the film is formed or impregnating the coated film or fleece.
Claim 2
Dependent Claim
140 words
A test strip made by a process which comprises: providing a carrier layer having an upper side and a lower side and being made of one of a multifilar fabric or fleece; applying and thereafter drying a coating mass of one of a suspension or dispersion of at least one synthetic resin in a solvent as a layer on the carrier layer so that most of the coating mass remains on the upper side of the carrier layer to obtain a fabric or fleece coated with a film layer of said coating mass wherein said film layer is coatingly embedded at least preponderantly on and into only one side of the carrier layer; and introducing at least one reagent by at least one of admixing with the resin before the film is formed or impregnating the coated film or fleece.
Claim 3
Dependent Claim
27 words
The test strip of claim 1, wherein said carrier layer consists of at least one substance selected from the group consisting of polyester, polyamide, cotton and cellulose.
Claim 4
Dependent Claim
32 words
The test strip of claim 1, further comprising a mesh covering which covers the coated fabric or fleece and fixes the carrier layer and the film layer to the synthetic resin film.
Claim 5
Dependent Claim
22 words
The test strip of claim 1, wherein said film layer has a thickness when dry, of from about 10μ to about 200μ.
Claim 6
Dependent Claim
23 words
The test strip of claim 1, wherein said reagent film layer has a thickness, when dry, of from about 15μ to about 100μ.
Claim 7
Dependent Claim
26 words
The test strip of claim 1, wherein said process further comprises connecting a synthetic resin film and said coated fabric or fleece by a connecting means.
Claim 8
Dependent Claim
27 words
The test strip of claim 1 wherein said process further comprises attaching at least one edge of said coated fabric or fleece to a synthetic resin film.
Claim 9
Dependent Claim
26 words
The test strip of claim 7 wherein said process further comprises providing an absorbent layer between the coated fabric or fleece and said synthetic resin film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |