Patent US2390556A successfully refreshed from Google Patents.
US2390556A
Expired / Lapsed
US
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Catalytic cracking of partially oxidized hydrocarbons
Assignee: Individual
•
Filing: 1941-07-07
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Granted: 1945-12-11
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Expires: 1961-07-07
Abstract
No abstract record available.
Inventors
- 👤 Robert F Ruthruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:46
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/14; C; C10; C10G; C10G11/00; C10G11/02; C10G11/20; C10G11/22
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) | 1948-12-10 | 1949-06-11 | 1949-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-10 | 1953-06-11 | 1953-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-10 | 1957-06-11 | 1957-12-11 | $7700.00 | Window Closed / Lapsed |