US3989462A
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Test composition for detecting urobilinogen
Assignee: Honeywell Riedel de Haen AG
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Filing: 1976-05-10
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Granted: 1976-11-02
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Expires: 1996-05-10
Abstract
Abstract 4-Fluoro-3-nitrobenzenediazonium salts in test compositions capable of specific and sensitive determination of urobilinogen without any interference of bilirubin in an aqueous solution or body fluid such as urine. The diazonium salts have incorporated special stabilizing anions. In addition to a 4-fluoro-3-nitrobenzene diazonium salt, the test compositions preferably include an acid constituent capable of producing an acid pH upon contacting the solution to be tested. The test device comprises a bibulous carrier member, such as paper impregnated with the test composition in dry form.
Inventors
- 👤 Wolfgang Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:00
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/145555; Y10T436/146666
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
Test composition for detecting urobilinogen in liquids, preferably in biological fluids, especially in urine, comprising a diazonium salt of the formula T ##SPC2## in which X - represents a stabilizing anion selected from the group consisting of a chloride, sulfate, tetrafluoroborate, hexafluoroantimonate, hexafluoroantimony sulfonate, trifluoromethyl sulfonate, aryl sulfonate, or carboxylic acid radical and at least one solid acid and optionally a wetting agent and one or several stabilizers.
Claim 2
Dependent Claim
68 words
Test composition for detecting urobilinogen in liquids, preferably in biological fluids, especially in urine, comprising a diazonium salt of the formula T ##SPC2## in which X - represents a stabilizing anion selected from the group consisting of a chloride, sulfate, tetrafluoroborate, hexafluoroantimonate, hexafluoroantimony sulfonate, trifluoromethyl sulfonate, aryl sulfonate, or carboxylic acid radical and at least one solid acid and optionally a wetting agent and one or several stabilizers.
Claim 3
Dependent Claim
13 words
Test composition as claimed in claim 1, which contains additionally a wetting agent.
Claim 4
Dependent Claim
14 words
Test composition as claimed in claim 1, which contains additionally at least one stabilizer.
Claim 5
Dependent Claim
13 words
Test combination as claimed in claim 1, which contains additionally an optical brightener.
Claim 6
Dependent Claim
12 words
Test composition as claimed in claim 1, supported on an absorbent carrier.
Claim 7
Dependent Claim
18 words
Test composition as claimed in claim 1, which contains additionally a wetting agent and at least one stabilizer.
Claim 8
Dependent Claim
42 words
Test composition as claimed in claim 6, wherein the diazonium salt is 4-fluoro-3-nitrobenzene diazonium tetrafluoroborate, the acid is a mixture of metaphosphoric acid and citric acid, the wetting agent is dodecylbenzenesulfonic acid and the stabilizer is the disodium salt of naphthalene-1,5-disulfonic acid.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |