US1983287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling structure and circulating pump
Assignee: Union Oil Company of California
•
Filing: 1932-10-04
•
Granted: 1934-12-04
•
Expires: 1952-10-04
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Grinnell
- 👤 Albert C Rubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:46
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/18; E21B7/00; E21B21/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-12-03 | 1938-06-04 | 1938-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-03 | 1942-06-04 | 1942-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-03 | 1946-06-04 | 1946-12-04 | $7700.00 | Window Closed / Lapsed |