US3812153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing monoalkanoyl-fluoresceins
Assignee: F Hoffmann La Roche AG
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Filing: 1972-12-05
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Granted: 1974-05-21
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Expires: 1992-12-05
Abstract
Abstract HIGHER MONOALKANOYLFLUORESCEINS ARE PREPARED BY A PROCESS WHEREIN A HIGHER ALKANOYL HALIDE AND FLUORESCEIN ARE REACTED IN A SUITABLE APROTIC SOLVENT AND THE PRODUCT, HIGHER MONOALKANOYLFLUORESCEIN, SUBSTANTIALLY FREE OF UNDESIRABLE CONTAMINANTS AND CO-PRODUCTS IS ISOLATED. THE HIGHER ALKANOYFLUORESCEINS ARE USEFUL IN FLUOROMETRIC METHODS FOR DETERMINING LIPOLYTIC HEMOLYSIS.
Inventors
- 👤 H Gurien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:16
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/34; C12Q1/44; C09; C09B; C09B11/00; C09B11/04; C09B11/06; C09B11/08; G; G01; G01N; G01N31/00; G01N31/22; C12Q2334/00; C12Q2334/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |