US2291911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for raising oil and gas from oil wells
Assignee: Individual
•
Filing: 1939-03-07
•
Granted: 1942-08-04
•
Expires: 1959-03-07
Abstract
No abstract record available.
Inventors
- 👤 Mcmahon William Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:02
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/129; F; F04; F04F; F04F5/00; F04F5/02
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) | 1945-08-03 | 1946-02-02 | 1946-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-03 | 1950-02-02 | 1950-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-03 | 1954-02-02 | 1954-08-04 | $7700.00 | Window Closed / Lapsed |