Patent US2306261A successfully refreshed from Google Patents.
US2306261A
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US
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Catalytic conversions and catalysts therefor
Assignee: Shell Development Co
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Filing: 1941-11-25
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Granted: 1942-12-22
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Expires: 1961-11-25
Abstract
No abstract record available.
Inventors
- 👤 Chester C Crawford
- 👤 William E Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:26
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/271; C07C5/2718; C07C5/2721; B; B01; B01J; B01J27/00; B01J27/06; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/60; C07C2527/00; C07C2527/06; C07C2527/125; C07C2527/126; C07C2531/00; C07C2531/02
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) | 1945-12-21 | 1946-06-22 | 1946-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-21 | 1950-06-22 | 1950-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-21 | 1954-06-22 | 1954-12-22 | $7700.00 | Window Closed / Lapsed |