US2594666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch assembly for drawworks
Assignee: National Supply Co
•
Filing: 1949-04-13
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Granted: 1952-04-29
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Expires: 1969-04-13
Abstract
No abstract record available.
Inventors
- 👤 Spencer W Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:10
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B3/06; F; F16; F16D; F16D25/00; F16D25/10; Y; Y10; Y10S; Y10S74/00; Y10S74/11; Y10T; Y10T74/00; Y10T74/19; Y10T74/19019; Y10T74/19023; Y10T74/19074; Y10T74/19079; Y10T74/19102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |