Patent US2870993A successfully refreshed from Google Patents.
US2870993A
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Core bit drilling tool
Assignee: KOEBEL DIAMOND TOOL CO
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Filing: 1956-09-27
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Granted: 1959-01-27
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Expires: 1976-09-27
Abstract
No abstract record available.
Inventors
- 👤 David H Jahnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:14
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/041; B23; B23Q; B23Q11/00; B23Q11/0042; B23Q11/006; E; E21; E21B; E21B25/00; E21B21/00; E21B21/01; E21B21/015; Y; Y10; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/453; Y10T408/455; Y10T408/55; Y10T408/554; Y10T408/81
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |