Patent US3420302A successfully refreshed from Google Patents.
US3420302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil processing system
Assignee: GUY G EDWARDS
•
Filing: 1967-04-11
•
Granted: 1969-01-07
•
Expires: 1987-04-11
Abstract
No abstract record available.
Inventors
- 👤 Guy G Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:49
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US56989A
Cited
US1484718A
Cited
US2349536A
Cited
US2914124A
Cited
US2911047A
Cited
US2998069A
Cited
US2908331A
Cited
US2980184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |