Patent US3915647A successfully refreshed from Google Patents.
US3915647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for determining the concentration of a substance in a fluid
Assignee: Polaroid Corp
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Filing: 1974-08-16
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Granted: 1975-10-28
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Expires: 1994-08-16
Abstract
Abstract A diagnostic test device which includes a cavity adapted to receive a fluid containing a substance to be tested, reagents adapted to contact said fluid and react with said substance to form a second substance capable of providing a visual determination of the presence and/or concentration of said first substance. In a preferred embodiment, chromatographic methods are employed to provide visual indication of the second substance.
Inventors
- 👤 Richard F Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:19
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/54; C12Q1/48; C12Q1/58; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
40 words
A DEVICE FOR DETERMINING THE CONCENTRATION OF A SUBSTANCE IN A FLUID WHICH COMPRISES: A FLUID RECEIVING CAVITY, A COLORIMETRIC INDICATOR SYSTEM, AND COMMUNICATING MEANS CONNECTING SAID CAVITY WITH SAID COLORIMETRIC INDICATOR SYSTEM, SAID COMMUNICATING MEANS INCLUDING A POROUS WICK.
Claim 2
Independent Claim
40 words
A DEVICE FOR DETERMINING THE CONCENTRATION OF A SUBSTANCE IN A FLUID WHICH COMPRISES: A FLUID RECEIVING CAVITY, A COLORIMETRIC INDICATOR SYSTEM, AND COMMUNICATING MEANS CONNECTING SAID CAVITY WITH SAID COLORIMETRIC INDICATOR SYSTEM, SAID COMMUNICATING MEANS INCLUDING A POROUS WICK.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said colorimetric indicator system comprises precipitation chromatography.
Claim 4
Dependent Claim
33 words
A device as defined in claim 1 which includes, disposed in said fluid receiving cavity, reagents adapted to react with said substance to provide a visual indication of the concentration of said substance.
Claim 5
Dependent Claim
14 words
The device of claim 3 wherein said reagents comprise enzymes, coenzymes and colorimetric indicators.
Claim 6
Dependent Claim
11 words
The device of claim 4 wherein said wick contains said reagents.
Claim 7
Dependent Claim
19 words
The device of claim 5 wherein said reagents comprise hexokinase, glucose-6-phosphate dehydrogenase, adenosine triphosphate and nicotinamide adenine dinucleotide phosphate.
Claim 8
Independent Claim
98 words
A device for determining the concentration of a substance in a fluid which comprises a cavity adapted to receive said fluid; closure means for said cavity; cavity volume indicating means associated with said cavity, reagents disposed in said cavity adapted to react with said substance to provide a visual indication of the concentration of said substance; constricted passage means connecting said cavity and colorimetric indicator means where the visual indication of the concentration of the substance is adapted to be generated; a porous wick retained in said passageway and a transparent cover sheet overlying said colorimetric indicator means.
Claim 9
Independent Claim
98 words
A device for determining the concentration of a substance in a fluid which comprises a cavity adapted to receive said fluid; closure means for said cavity; cavity volume indicating means associated with said cavity, reagents disposed in said cavity adapted to react with said substance to provide a visual indication of the concentration of said substance; constricted passage means connecting said cavity and colorimetric indicator means where the visual indication of the concentration of the substance is adapted to be generated; a porous wick retained in said passageway and a transparent cover sheet overlying said colorimetric indicator means.
Claim 10
Dependent Claim
12 words
The device of claim 7 wherein said wick comprises a microporous filter.
Claim 11
Dependent Claim
15 words
The device of claim 7 wherein said colorimetric indicator means comprises a precipitation chromatographic sheet.
Claim 12
Dependent Claim
23 words
The device of claim 7 wherein said transparent sheet overlying said colorimetric indicator means includes a scale indicating concentration standards for said substance.
Claim 13
Dependent Claim
23 words
The device of claim 7 which includes means for removing undesirable components from said fluid prior To contacting said reagents with said fluid.
Claim 14
Dependent Claim
26 words
The device of claim 7 wherein said device includes time delay means to provide contact between said reagents and said substance in a predetermined time sequence.
Claim 15
Dependent Claim
14 words
The device of claim 7 wherein said reagents comprise enzymes, coenzymes and colorimetric indicators.
Claim 16
Dependent Claim
20 words
The device of claim 13 wherein said reactants comprise hexokinase and glucose-6-phosphate dehydrogenase, adenosine triphosphate and nicotinamide adenine dinucleotide phosphate.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |