US2400959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation and dehydrogenation catalysts
Assignee: IOWA STATE COLLEGE RES FOUND
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Filing: 1940-12-18
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Granted: 1946-05-28
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Expires: 1960-12-18
Abstract
No abstract record available.
Inventors
- 👤 Stewart Meredith Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/143; C07C29/145; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/42; C07D307/44
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) | 1949-05-27 | 1949-11-26 | 1950-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-05-27 | 1953-11-26 | 1954-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-05-27 | 1957-11-26 | 1958-05-28 | $7700.00 | Window Closed / Lapsed |