Patent US1944840A successfully refreshed from Google Patents.
US1944840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control head for wells
Assignee: Individual
•
Filing: 1933-02-24
•
Granted: 1934-01-23
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Expires: 1953-02-24
Abstract
No abstract record available.
Inventors
- 👤 Granville A Humason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87708; Y10T137/8774; Y10T29/00; Y10T29/53; Y10T29/53552
Claims Analysis
Total Claims: 0
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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) | 1937-01-22 | 1937-07-24 | 1938-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-22 | 1941-07-24 | 1942-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-22 | 1945-07-24 | 1946-01-23 | $7700.00 | Window Closed / Lapsed |