US4486536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Specimen slide for occult blood testing
Assignee: SMITHLKINE INSTRUMENTS INC 485 PORTERERO AVE SUNNYVALE CA94086 A CORP OF DE
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Filing: 1982-08-19
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Granted: 1984-12-04
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Expires: 2002-08-19
Abstract
Abstract A method and novel absorbent substrate for determining the presence of occult blood in gastric fluid. The substrate is acid treated and contains guaiac. The method includes the addition of the gastric fluid to the acid treated guaiac substrate which is developed with a buffered developing solution. Preferably the substrate is an acid treated sheet of absorbent paper and the developing solution is an aqueous buffered solution of hydrogen peroxide.
Inventors
- 👤 Josefina T. Baker
- 👤 Paul J. Lawrence
- 👤 Charles W. Townsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:13
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/721; G01N33/726
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
A method of testing for occult blood in gastric fluid which comprises applying the gastric fluid to an unbuffered acid treated absorbent substrate containing guaiac as a reagent and applying a buffered developing solution to said substrate and observing if the substrate is colored blue.
Claim 2
Independent Claim
45 words
A method of testing for occult blood in gastric fluid which comprises applying the gastric fluid to an unbuffered acid treated absorbent substrate containing guaiac as a reagent and applying a buffered developing solution to said substrate and observing if the substrate is colored blue.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the developing solution contains hydrogen peroxide.
Claim 4
Dependent Claim
128 words
A specimen test slide for testing occult blood in gastric fluid comprising a panel having one or more openings, an unbuffered acid treated absorbent test strip containing guaiac underlying said panel and extending under said openings for the reception of a specimen, a pH test area on a portion of the test strip underlying one of said openings, a pH Color Comparator Scale located on said panel to compare the color obtained in the pH test area to the Comparator, an occult blood test area and performance monitors printed on a portion of the test strip underlying another of said openings, a hinged cover adapted to overlie a portion of the panel and cover said openings and locking means thereon to lock the cover in a closed position.
Claim 5
Dependent Claim
128 words
A specimen test slide for testing occult blood in gastric fluid comprising a panel having one or more openings, an unbuffered acid treated absorbent test strip containing guaiac underlying said panel and extending under said openings for the reception of a specimen, a pH test area on a portion of the test strip underlying one of said openings, a pH Color Comparator Scale located on said panel to compare the color obtained in the pH test area to the Comparator, an occult blood test area and performance monitors printed on a portion of the test strip underlying another of said openings, a hinged cover adapted to overlie a portion of the panel and cover said openings and locking means thereon to lock the cover in a closed position.
Claim 6
Dependent Claim
23 words
The test slide of claim 3 in which the Color Comparators are printed on a tear off flap which covers the performance monitors.
Claim 7
Dependent Claim
18 words
The test slide of claim 3 in which the pH test area is printed on the test strip.
Claim 8
Dependent Claim
39 words
A test kit for determining the presence of occult blood in gastric fluid which comprises the slide of claim 3 and a receptacle containing a buffered developing solution which reacts with the guaiac to color the test strip blue.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |