US2491500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled catalytic vapor phase process
Assignee: Standard Oil Development Co
•
Filing: 1946-05-07
•
Granted: 1949-12-20
•
Expires: 1966-05-07
Abstract
No abstract record available.
Inventors
- 👤 John P Longwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:38
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/388
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2340878A
Cited
US2373008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |