Patent US2667334A successfully refreshed from Google Patents.
US2667334A
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US
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Full hole diamond bit
Assignee: Standard Oil Development Co
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Filing: 1951-03-03
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Granted: 1954-01-26
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Expires: 1971-03-03
Abstract
No abstract record available.
Inventors
- 👤 John E Ortloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/02; E21B10/04
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |