US3639447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl diesters of 3 5-dialkyl-4-hydroxyphenylalkanoic acid
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1968-03-07
•
Granted: 1972-02-01
•
Expires: 1988-03-07
Abstract
Abstract PHENOLIC ESTERS HAVING ANTIOXIDANT PROPERTIES ARE DISCLOSED. THE ESTERS ARE DIOL DIALKANOATES. TYPICAL EXAMPLES ARE DECAMETHYLENE DIOL DI-(BIS-(3,5-DITERT-BUTYL-4-BYDROXYPHENYL) ACETATE), AND BEXAMETHYLENE DIOL DI(BIS(3,5-DI-TERT-BUTYL-4HYDROXYPHENYL) ACETATE).
Inventors
- 👤 George Wright Taylor
- 👤 Derck Harold Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C07; C07C; C07C323/00; C08K5/04; C08K5/10; C08K5/12; C08K5/13; C08K5/134; C08K5/1345; C08K5/372
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |