US2443247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyalkyl benzenes
Assignee: Standard Oil Development Co
•
Filing: 1943-08-26
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Granted: 1948-06-15
•
Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:13
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C2527/00; C07C2527/06; C07C2527/125; C07C2527/126
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) | 1951-06-15 | 1951-12-15 | 1952-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-15 | 1955-12-15 | 1956-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-15 | 1959-12-15 | 1960-06-15 | $7700.00 | Window Closed / Lapsed |