US2657222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,6-di-tertiary alkyl quinones and process of preparing same
Assignee: Eastman Kodak Co
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Filing: 1951-04-28
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Granted: 1953-10-27
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Expires: 1971-04-28
Abstract
No abstract record available.
Inventors
- 👤 Charles F H Allen
- 👤 Donald M Burness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:48
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/729; A23B2/742; A23B2/75; C07; C07C; C07C46/00; C07C46/02; C07C46/06; C07C50/00; C07C50/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD FOR PREPARING A 2.6-DI-TERT.-ALKYLQUINONE WHICH COMPRISES OXIDIZING A 4-ACETOXY3,5-DI-TERT.-ALKYLTOLUENE THE TERTIARY ALKYL GROUPS OF WHICH EACH CONTAIN FROM 4 TO 5 CARBON ATOMS, IN A SOLUTION OF GLACIAL ACETIC ACID AND ACETIC ANHYDRIDE IN THE PRESENCE OF SULFURIC ACID AND CHROMIC ANHYDRIDE.
Claim 2
Independent Claim
44 words
A METHOD FOR PREPARING A 2.6-DI-TERT.-ALKYLQUINONE WHICH COMPRISES OXIDIZING A 4-ACETOXY3,5-DI-TERT.-ALKYLTOLUENE THE TERTIARY ALKYL GROUPS OF WHICH EACH CONTAIN FROM 4 TO 5 CARBON ATOMS, IN A SOLUTION OF GLACIAL ACETIC ACID AND ACETIC ANHYDRIDE IN THE PRESENCE OF SULFURIC ACID AND CHROMIC ANHYDRIDE.
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |