US2490488A
Expired / Lapsed
US
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Hydrocarbon synthesis catalyst
Assignee: Phillips Petroleum Co
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Filing: 1947-03-28
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Granted: 1949-12-06
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Expires: 1967-03-28
Abstract
No abstract record available.
Inventors
- 👤 Stewart S Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:28
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/15; C07C29/151; C07C29/1512; B; B01; B01J; B01J27/00; B01J27/02; B01J27/04; B01J27/047; B01J27/051; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/043; C07C29/153; C07C2523/00; C07C2523/02; C07C2523/04; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/047; C07C2527/051
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) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |