Patent US575946A successfully refreshed from Google Patents.
US4738823A
Expired / Lapsed
US
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Test strip with adjustable sample absorption capacity
Assignee: Bayer Corp
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Filing: 1986-08-07
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Granted: 1988-04-19
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Expires: 2006-08-07
Abstract
Abstract A test strip with a sample absorption capacity which can be preselected comprises a support member capable of supporting along at least two edges a reagent strip in which the support member also has absorbent material positioned to remove excess sample applied to the reagent strip. In a preferred embodiment an intermediate layer is also supported by the support member and positioned above the reagent strip. The intermediate layer removes components of the sample which would otherwise interfere with the analysis being made in the reagent strip. In a further embodiment of the invention a cover is applied to the support member, wherein the cover contains an opening for introduction of sample material.
Inventors
- 👤 Helmut Engelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:57
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
A device for the quantitative analysis of liquid sample, which test device comprises: a support member having a depression therein, a reagent matrix positioned in said depression, and liquid absorbent material positioned at the edges of said depression to absorb excess liquid sample, thereby providing a reproducible sample volume.
Claim 2
Independent Claim
49 words
A device for the quantitative analysis of liquid sample, which test device comprises: a support member having a depression therein, a reagent matrix positioned in said depression, and liquid absorbent material positioned at the edges of said depression to absorb excess liquid sample, thereby providing a reproducible sample volume.
Claim 3
Dependent Claim
34 words
The test device of claim 1 wherein the test device further comprises a cover over the depression in the support member and wherein the cover has an opening for the introduction of a sample.
Claim 4
Dependent Claim
35 words
The test device of claim 1 which further comprises an intermediate layer for removing undesired constituents from a liquid sample, said intermediate layer being liquid permeable and positioned in the depression above the reagent matrix.
Claim 5
Dependent Claim
21 words
The test device according to claim 1 in which the absorbent material is paper, fabric or plastic which absorbs excess sample.
References Cited (Backward Citations)
US2918893A
Cited
US3067015A
Cited
US3809617A
Cited
US4181500A
Cited
US4199550A
Cited
US4178153A
Cited
US4631174A
Cited
US4254083A
Cited
US4323536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |