US3536608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal liquefaction process
Assignee: Universal Oil Products Co
•
Filing: 1968-08-20
•
Granted: 1970-10-27
•
Expires: 1988-08-20
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Riedl
- 👤 Richard S Corey
- 👤 Roy E Svacha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:46
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065; C10G1/04; C10G1/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2871181A
Cited
US3018242A
Cited
US3018241A
Cited
US3120474A
Cited
US3162594A
Cited
US3247092A
Cited
US3183180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |