Patent US2986453A successfully refreshed from Google Patents.
US2986453A
Expired / Lapsed
US
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Diagnostic compositions
Assignee: Bayer Corp
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Filing: 1957-11-13
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Granted: 1961-05-30
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Expires: 1977-11-13
Abstract
No abstract record available.
Inventors
- 👤 Galen F Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:47
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/68; G01N33/6803; G01N33/6827; G01N33/6839
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN A DIAGOSTIC COMPOSITION FOR THE DETERMINATION OF ALBUMIN IN LIQUIDS, WHICH COMPOSITION INCLUDES AS AN INDICATOR THE ETHYL ESTER OF TETRABROMOPHENOLPHTHALEIN AND A CITRATE BUFFER FOR MAINTAINING SAID INDICATOR AT A PH ON THE ACID SIDE OF ITS ACID-TO-BASE COLOR-CHANGE POINT WHEN THE COMPOSITION IS WETTED WITH THE LIQUID BEING TESTED, THE IMPROVEMENT WHICH COMPRISES THE INCLUSION IN SAID COMPOSITION OF A MINOR PROPORTION OF AN ANIONIC SURFACE ACTIVE AGENT.
Claim 2
Dependent Claim
71 words
IN A DIAGOSTIC COMPOSITION FOR THE DETERMINATION OF ALBUMIN IN LIQUIDS, WHICH COMPOSITION INCLUDES AS AN INDICATOR THE ETHYL ESTER OF TETRABROMOPHENOLPHTHALEIN AND A CITRATE BUFFER FOR MAINTAINING SAID INDICATOR AT A PH ON THE ACID SIDE OF ITS ACID-TO-BASE COLOR-CHANGE POINT WHEN THE COMPOSITION IS WETTED WITH THE LIQUID BEING TESTED, THE IMPROVEMENT WHICH COMPRISES THE INCLUSION IN SAID COMPOSITION OF A MINOR PROPORTION OF AN ANIONIC SURFACE ACTIVE AGENT.
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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |