Patent US1938860A successfully refreshed from Google Patents.
US1938860A
Expired / Lapsed
US
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Tool retainer
Assignee: Cleveland Rock Drill Co
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Filing: 1932-06-27
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Granted: 1933-12-12
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Expires: 1952-06-27
Abstract
No abstract record available.
Inventors
- 👤 John E Renfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:26
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/08; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17076; Y10T279/17761; Y10T279/17786; Y10T403/00; Y10T403/59
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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |