US3667915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric methods and compositions for determining iron in blood
Assignee: F Hoffmann La Roche AG
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Filing: 1970-04-28
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Granted: 1972-06-06
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Expires: 1990-04-28
Abstract
Abstract A DIAGNOSTIC KIT IS DESCRIBED COMPRISING AS A FIRST REAGENT A REDUCING AGENT AND, AS A SECOND REAGENT, A BUFFERED 5-(PYRDYL)-2''-1,4-BENZODIAZEPINE, OR A WATERSOLUBLE ACID ADDITION SALT THEREOF. THE ENZODIAZEPINE IS BUFFERED WITH A BUFFER PAIR COMPRISING A WATER-SOLUBLE SALT OF ACETIC ACID AND EITHER ASCORBIC ACID OR ACETIC ACID. ALSO DESCRIBED IS A METHOD OF UTILIZING THESE REAGENTS IN AQUEOUS SOLUTION IN A CONTINOUS FLOW QUANTITTIVE ANALYSIS OF THE IRON IN SERUM.
Inventors
- 👤 Bernard Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:50
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/84; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/118339
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |