Patent US4717545A successfully refreshed from Google Patents.
US4717545A
Expired / Lapsed
US
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Device and method for chemical analysis of fluids with a reagent coated light source
Assignee: Bayer Corp
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Filing: 1986-09-11
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Granted: 1988-01-05
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Expires: 2006-09-11
Abstract
Abstract A device for measuring transmittance of light comprises a light source, photodetector and signal processor. The concentration of a substance in a fluid sample can be accurately determined by coating the light source with a reagent that is chemically reactive with the substance and measuring light transmitted from the coating before and after the substance is applied to the coating. The coating can contain a solid support matrix, such as a translucent nonwoven paper web of the type used in reagent test strips and similar indicator devices. The invention is useful for making clinical analyses on body fluids.
Inventors
- 👤 David A. N. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/17; G01N21/25; G01N21/255; Y; Y10; Y10S; Y10S435/00; Y10S435/808; Y10S436/00; Y10S436/805
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A device for determining the presence or concentration of a ligand in a specimen by measuring light, wherein the device consisting essentially of light source means for providing illumination; light responsive means for generating an electrical signal in response to light; and means for measuring the electrical signal from the light responsive means; wherein the light source has an end surface through which or from which light passes; and said end surface contains a reagent that is chemically reactive with a ligand in a specimen; and light from the light source passes through the end surface and through or from the end surface to the light responsive means.
Claim 2
Independent Claim
108 words
A device for determining the presence or concentration of a ligand in a specimen by measuring light, wherein the device consisting essentially of light source means for providing illumination; light responsive means for generating an electrical signal in response to light; and means for measuring the electrical signal from the light responsive means; wherein the light source has an end surface through which or from which light passes; and said end surface contains a reagent that is chemically reactive with a ligand in a specimen; and light from the light source passes through the end surface and through or from the end surface to the light responsive means.
Claim 3
Dependent Claim
11 words
Device according to claim 1, wherein the coating contains the ligand.
Claim 4
Dependent Claim
18 words
Device according to claim 2, wherein the coating contains the reaction product of the ligand and the reagent.
Claim 5
Dependent Claim
16 words
Device according to claim 1, wherein the coating contains a solid, transparent or translucent support matrix.
Claim 6
Dependent Claim
14 words
Device according to claim 4, wherein the support matrix is a non-woven paper web.
Claim 7
Dependent Claim
36 words
Device according to claim 4, wherein the light source is a light-emitting diode having a substantially flat transparent or translucent end surface through which the light passes, and wherein the coating is on the flat surface.
Claim 8
Dependent Claim
13 words
Device according to claim 6, wherein the light-emitting diode emits substantially monochromatic light.
Claim 9
Dependent Claim
39 words
Device according to claim 6, wherein the transmitted light from the coating has a longitudinal axis and the light responsive means is a photodetector having an optical axis that substantially coincides with the longitudinal axis of the transmitted light.
References Cited (Backward Citations)
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |