US2491350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of purified polyesters
Assignee: Standard Oil Development Co
•
Filing: 1945-03-03
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Granted: 1949-12-13
•
Expires: 1965-03-03
Abstract
No abstract record available.
Inventors
- 👤 David W Young
- 👤 William J Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199; C08G67/00; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C10L1/198; C10L1/1983; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/102; C10M2229/00; C10M2229/04; C10M2229/045; C10M2229/046; C10M2229/047; C10M2229/048; C10N; C10N2040/00; C10N2040/12; C10N2040/13; C10N2040/135; C10N2040/25; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB428864A
Cited
US2123641A
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US2352883A
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US2394909A
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US2384595A
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US2424588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |