Patent US2624752A successfully refreshed from Google Patents.
US2624752A
Expired / Lapsed
US
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Esters of tertiary alkyl-substituted aromatic acids
Assignee: Shell Development Co
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Filing: 1949-09-12
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Granted: 1953-01-06
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Expires: 1969-09-12
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 John L Van Winkle
- 👤 De Loss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:09
CPC Classifications
C; C07; C07C; C07C323/00; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
AN ESTER OF A PARA-TERTIARY ALKYL-SUBSTITUTED BENZOIC ACID AND A POLYHYDRIC ALCOHOL CONTAINING AT LEAST TWO ESTERIFIABLE HYDROXYL GROUPS, WHEREIN THE SAID PARA-TERTIARY ALKYL-SUBSTITUTED BENZOIC ACID IS THE ONLY ACID USED TO ESTERIFY THE SAID POLYHYDRIC ALCOHOL.
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) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |