US3734929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hexahydro-3,3,6,6-tetramethylfluro-(3,2-b)-furan-2,5-dione and method of its preparation
Assignee: Eastman Kodak Co
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Filing: 1971-08-27
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Granted: 1973-05-22
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Expires: 1991-08-27
Abstract
Abstract HEXAHYDRO - 3,3,6, - TETRAMETHYLFURO-(O,2-B)-FURAN-2,5DIONE IS FORMED BY THE OXIDATION OF HEXAHYDRO-3,3,6,6TETRAMETHYLFURO-(3,2-B)-FURAN-2,5-DIOL USING HYPOHALOUS ACID OR SALTS OF A HYPOHALOUS ACID. THE REACTION MAY BE CONDUCTED UNDER ATMOSPHERIC PRESSURE AT TEMPERATURES FROM ABOUT 5* C. TO ABOUT 90*C. THE NOVEL COMPOUND HEXAHYDRO - 3,3,6,6 - TETRAMETHYLFURO-(O,2 - B)-FURAN-2,5DIOL IS USEFUL AS A REACTIVE CHEMICAL INTERMEDIATE WHICH CAN BE USED TO PRODUCE STABILIZERS FOR PLASTICS, SOLVENTS, PLASTICIZERS, SYNTHETIC LUBRICANTS AND POLYESERS.
Inventors
- 👤 A Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |