US2551145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cracking system
Assignee: Phillips Petroleum Co
•
Filing: 1943-04-13
•
Granted: 1951-05-01
•
Expires: 1963-04-13
Abstract
No abstract record available.
Inventors
- 👤 John W Loy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:56
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2073638A
Cited
US2254555A
Cited
US2304653A
Cited
US2357332A
Cited
US2322984A
Cited
US2388536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |