Patent FR636693A successfully refreshed from Google Patents.
Patent EP0388032A2 successfully refreshed from Google Patents.
US2633449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of heavy hydrocarbons
Assignee: Sinclair Refining Co
•
Filing: 1949-12-28
•
Granted: 1953-03-31
•
Expires: 1969-12-28
Abstract
No abstract record available.
Inventors
- 👤 Leroy K Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:02
CPC Classifications
C; C10; C10G; C10G9/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1673854A
Cited
US2023619A
Cited
US1953013A
Cited
US2096589A
Cited
US2101088A
Cited
US2045458A
Cited
US2172276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |