Patent US3681991A successfully refreshed from Google Patents.
Patent US3882538A successfully refreshed from Google Patents.
US1532330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic expanding oil drill
Assignee: Individual
•
Filing: 1923-10-22
•
Granted: 1925-04-07
•
Expires: 1943-10-22
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Donald Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:09
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/325
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) | 1928-04-06 | 1928-10-06 | 1929-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-06 | 1932-10-06 | 1933-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-06 | 1936-10-06 | 1937-04-07 | $7700.00 | Window Closed / Lapsed |