US2771571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic chuck face plate
Assignee: Individual
•
Filing: 1952-04-08
•
Granted: 1956-11-20
•
Expires: 1972-04-08
Abstract
No abstract record available.
Inventors
- 👤 George J Carson
- 👤 Einar B Hallberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:36
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; Y; Y10; Y10T; Y10T279/00; Y10T279/23
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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |