US3499490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing oxygenated products from oil shale
Assignee: Phillips Petroleum Co
•
Filing: 1967-04-03
•
Granted: 1970-03-10
•
Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Riley B Needham
- 👤 Dixon W Peacock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; E21B43/16; E21B43/24; E21B43/243; E21B43/247
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2813583A
Cited
US3180414A
Cited
US3205944A
Cited
US3221809A
Cited
US3284281A
Cited
US3382922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |