Patent US2897693A successfully refreshed from Google Patents.
US2897693A
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US
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Drilling apparatus
Assignee: Bendix Aviation Corp
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Filing: 1956-05-28
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Granted: 1959-08-04
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Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 Charles N Menz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:02
CPC Classifications
B; B23; B23B; B23B49/00; B23B49/06; Y; Y10; Y10T; Y10T408/00; Y10T408/16; Y10T408/17; Y10T408/173; Y10T408/175; Y10T408/36; Y10T408/38; Y10T408/3833
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |