US2452172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for catalytic cracking of hydrocarbon oils
Assignee: GULL OIL Corp
•
Filing: 1945-10-17
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Granted: 1948-10-26
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Expires: 1965-10-17
Abstract
No abstract record available.
Inventors
- 👤 Herbert B Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US669411A
Cited
GB456637A
Cited
US2298593A
Cited
US2353505A
Cited
US2339874A
Cited
US2344449A
Cited
US2386846A
Cited
US2446986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |