Patent US2645138A successfully refreshed from Google Patents.
US2645138A
Expired / Lapsed
US
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Drill bit forging machine
Assignee: Individual
•
Filing: 1949-04-25
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Granted: 1953-07-14
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Expires: 1969-04-25
Abstract
No abstract record available.
Inventors
- 👤 Albert W Mitchhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:48
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/02; B21K5/06; B21J; B21J7/00; B21J7/20; B21J7/22; B21J7/24; B21J7/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1072358A
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FR424510A
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US1085978A
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US1389501A
Cited
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US2063043A
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US2091408A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |