US2051249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical driving machine
Assignee: Individual
•
Filing: 1925-01-09
•
Granted: 1936-08-18
•
Expires: 1945-01-09
Abstract
No abstract record available.
Inventors
- 👤 Charles R Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; Y; Y10; Y10T; Y10T83/00; Y10T83/647; Y10T83/6492; Y10T83/6499; Y10T83/6508; Y10T83/6515; Y10T83/6516
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) | 1939-08-18 | 1940-02-17 | 1940-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-18 | 1944-02-17 | 1944-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-18 | 1948-02-17 | 1948-08-18 | $7700.00 | Window Closed / Lapsed |