Patent US3481867A successfully refreshed from Google Patents.
US3481867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage catalytic hydrogenation process for upgrading crude shale oil
Assignee: Sinclair Research Inc
•
Filing: 1966-08-29
•
Granted: 1969-12-02
•
Expires: 1986-08-29
Abstract
No abstract record available.
Inventors
- 👤 Richard H Dellert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:55
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3025231A
Cited
US3017345A
Cited
US3277199A
Cited
US3180820A
Cited
US3297563A
Cited
US3362901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |