US4532107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reagent test device
Assignee: Bayer Corp
•
Filing: 1984-03-26
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Granted: 1985-07-30
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Expires: 2004-03-26
Abstract
Abstract The substrate of conventional reagent test devices is replaced by polyester screen material having a nominal filter rating of from about 80 to about 130 microns such that liquid present in the reagent matrix material of the test device is retained therein and prevented from running over onto other reagent matrix areas present on the same reagent test device.
Inventors
- 👤 M. Sultan Siddigi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:45
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/8483; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
Reagent test device comprising multiple reagent carrier matrices attached in spaced relationship to one side of a supporting substrate, wherein the substrate is a hydrophilic polyester screen material having a nominal filter rating of from about 80 to about 130 microns.
Claim 2
Dependent Claim
41 words
Reagent test device comprising multiple reagent carrier matrices attached in spaced relationship to one side of a supporting substrate, wherein the substrate is a hydrophilic polyester screen material having a nominal filter rating of from about 80 to about 130 microns.
Claim 3
Dependent Claim
20 words
The test device of claim 1 in which the nominal filter rating is from about 80 to about 90 microns.
Claim 4
Dependent Claim
14 words
The test device of claim 1 in which the carrier matrices comprise filter paper.
Claim 5
Dependent Claim
13 words
The test device of claim 3 in which the substrate is polyethylene terephthalate.
Claim 6
Dependent Claim
18 words
The test device of claim 4 in which the substrate has a nominal filter rating of 86 microns.
Claim 7
Dependent Claim
15 words
The test device of claim 3 in which the screen material is a twill weave.
Claim 8
Dependent Claim
15 words
The test device of claim 4 in which the screen material is a twill weave.
Claim 9
Dependent Claim
52 words
A colorimetric reagent test device comprising multiple reagent carrier matrices incorporated with a colorimetric reagent or reactant system attached in spaced relationship to one side of a supporting substrate, wherein the supporting substrate is a hydrophilic polyester screen material having a nominal filter rating of from about 80 to about 130 microns.
Claim 10
Dependent Claim
52 words
A colorimetric reagent test device comprising multiple reagent carrier matrices incorporated with a colorimetric reagent or reactant system attached in spaced relationship to one side of a supporting substrate, wherein the supporting substrate is a hydrophilic polyester screen material having a nominal filter rating of from about 80 to about 130 microns.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |