US3733177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and compositions for the determination of uric acid in blood
Assignee: F Hoffmann La Roche AG
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Filing: 1972-01-03
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Granted: 1973-05-15
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Expires: 1992-01-03
Abstract
Abstract COLORIMETRIC METHODS AND COMPOSITIONS FOR THE QUANTITATIVE DETERMINATION OF THE URIC ACID CONTENT OF BLOOD BY TREATING SERUM AT AMBIENT TEMPERATURES WITH AN ALKALINE FERRICYANIDE SOLUTION, FOLLOWED BY THE ADDITION OF FERRIC IONS AND A 5-(2-PYRIDYL)-2H-1,4-BENZODI- AZEPINE OR WATER SOLUBLE SALE THEREOF TO PRODUCE A BRILLIANT PURPLE COLORED SOLUTION WHICH IS THEN QUANTITATIVELY MEASURED BY STANDARD COLORIMETRIC MEANS.
Inventors
- 👤 B Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:30
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/118339; Y10T436/14; Y10T436/145555; Y10T436/147777; Y10T436/148888
Claims Analysis
Total Claims: 0
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |