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Patent US2307891A successfully refreshed from Google Patents.
US2307891A
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Autocondensation product of high molecular alkyl aryl ketones and process for producing it
Assignee: Standard Oil Development Co
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Filing: 1939-11-13
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Granted: 1943-01-12
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Expires: 1959-11-13
Abstract
No abstract record available.
Inventors
- 👤 Lieber Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:23
CPC Classifications
C; C08; C08G; C08G6/00; C10; C10M; C10M1/00; C10M1/08; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2205/00; C10M2205/04; C10M2207/00; C10M2207/08; C10M2209/00; C10M2209/02; C10M2209/10
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) | 1946-01-11 | 1946-07-13 | 1947-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-01-11 | 1950-07-13 | 1951-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-01-11 | 1954-07-13 | 1955-01-12 | $7700.00 | Window Closed / Lapsed |