US3529668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam drive oil recovery process
Assignee: Union Oil Company of California
•
Filing: 1968-07-24
•
Granted: 1970-09-22
•
Expires: 1988-07-24
Abstract
No abstract record available.
Inventors
- 👤 George G Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:31
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/594; E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2875833A
Cited
US2866507A
Cited
US3249157A
Cited
US3311167A
Cited
US3342256A
Cited
US3318379A
Cited
US3369601A
Cited
US3386506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |