Patent US1451268A successfully refreshed from Google Patents.
US1451268A
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US
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Magnetic chuck
Assignee: Greenfield Tap & Die Corp
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Filing: 1919-03-05
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Granted: 1923-04-10
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Expires: 1939-03-05
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Morgan
- 👤 Winfred S Griffith
- 👤 Jr Edwin Churchill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:46
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1543
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-04-09 | 1926-10-09 | 1927-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-09 | 1930-10-09 | 1931-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-09 | 1934-10-09 | 1935-04-10 | $7700.00 | Window Closed / Lapsed |