Patent US2474881A successfully refreshed from Google Patents.
US2474881A
Expired / Lapsed
US
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Production of viscous oil by copolymerization of aromatic olefin with monoolefin
Assignee: Standard Oil Development Co
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Filing: 1945-12-12
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Granted: 1949-07-05
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Expires: 1965-12-12
Abstract
No abstract record available.
Inventors
- 👤 David W Young
- 👤 William H Smyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:42
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1213
Claims Analysis
Total Claims: 0
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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) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |