US2834575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power and transmission assembly for drilling rigs
Assignee: Youngstown Sheet and Tube Co
•
Filing: 1954-04-19
•
Granted: 1958-05-13
•
Expires: 1974-04-19
Abstract
No abstract record available.
Inventors
- 👤 Hughes Ardell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:36
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B3/06; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19014
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2204877A
Cited
US2243156A
Cited
US2488069A
Cited
US2613059A
Cited
US2576872A
Cited
US2541625A
Cited
US2672768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |