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Patent US2644810A successfully refreshed from Google Patents.
US2644810A
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Method of sulfurizing esters
Assignee: Standard Oil Co
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Filing: 1949-06-29
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Granted: 1953-07-07
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Expires: 1969-06-29
Abstract
No abstract record available.
Inventors
- 👤 Beretvas Helen Sellei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:25
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/02; C10M135/06; C10M2219/00; C10M2219/02; C10M2219/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
THE METHOD OF SULFURIZING AN UNSATURATED MONO-ESTER OF AN ALIPHATIC ACID HAVING THE GENERAL FORMULA
Claim 2
Independent Claim
15 words
THE METHOD OF SULFURIZING AN UNSATURATED MONO-ESTER OF AN ALIPHATIC ACID HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2218997A
Cited
US2257290A
Cited
US2313611A
Cited
US2289438A
Cited
US2337473A
Cited
US2417283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |