Patent US3924274A successfully refreshed from Google Patents.
US1900452A
Expired / Lapsed
US
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Driving means for oil well equipment
Assignee: Rexnord Industries LLC
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Filing: 1931-08-18
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Granted: 1933-03-07
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Expires: 1951-08-18
Abstract
No abstract record available.
Inventors
- 👤 Ledeen Hyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:27
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19079; Y10T74/19088; Y10T74/19102; Y10T74/19628; Y10T74/21; Y10T74/2173
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) | 1936-03-06 | 1936-09-05 | 1937-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-06 | 1940-09-05 | 1941-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-06 | 1944-09-05 | 1945-03-07 | $7700.00 | Window Closed / Lapsed |