US2111785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable fastening for drill bits
Assignee: HARDSOCG Manufacturing Co
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Filing: 1936-01-06
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Granted: 1938-03-22
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Expires: 1956-01-06
Abstract
No abstract record available.
Inventors
- 👤 Milton J Kittrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17761; Y10T279/17786
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) | 1941-03-21 | 1941-09-20 | 1942-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-03-21 | 1945-09-20 | 1946-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-03-21 | 1949-09-20 | 1950-03-22 | $7700.00 | Window Closed / Lapsed |