Patent US2492640A successfully refreshed from Google Patents.
US2492640A
Expired / Lapsed
US
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Diaphragm chuck
Assignee: NA Woodworth Co
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Filing: 1946-07-13
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Granted: 1949-12-27
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Expires: 1966-07-13
Abstract
No abstract record available.
Inventors
- 👤 Hohwart George
- 👤 Ernest F Hohwart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:22
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/32; Y; Y10; Y10T; Y10T279/00; Y10T279/31
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) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |