Patent US2906502A successfully refreshed from Google Patents.
US2906502A
Expired / Lapsed
US
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Underwater earth boring mechanism
Assignee: Individual
•
Filing: 1954-03-24
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Granted: 1959-09-29
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Expires: 1974-03-24
Abstract
No abstract record available.
Inventors
- 👤 Edward W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:10
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1517556A
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US2016068A
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US2000716A
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US2013070A
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US2178931A
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US2301783A
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US2548616A
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US2606003A
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US2803433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |