Patent US2947921A successfully refreshed from Google Patents.
US2947921A
Expired / Lapsed
US
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Fine grid permanent magnetic chuck
Assignee: Brown and Sharpe Manufacturing Co
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Filing: 1957-02-25
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Granted: 1960-08-02
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Ermand L Watelet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:43
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1546
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2269149A
Cited
US2609430A
Cited
AT174515B
Cited
US2678729A
Cited
US2795740A
Cited
FR1086496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |