Patent US2431961A successfully refreshed from Google Patents.
US2431961A
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Centrifugal chuck
Assignee: Individual
•
Filing: 1944-10-30
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Granted: 1947-12-02
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Expires: 1964-10-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest B Phillips
- 👤 Berthoff Nathaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/40; B23B31/4006; B23B31/02; B23B31/10; B23B31/12; B23B31/14; B23B31/142; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1004; Y10T279/17; Y10T279/17411; Y10T279/17418; Y10T279/17427; Y10T279/24; Y10T279/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312628A
Cited
US1431761A
Cited
GB120134A
Cited
US1464551A
Cited
US2101790A
Cited
US2408503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |