Patent US2950090A successfully refreshed from Google Patents.
US2950090A
Expired / Lapsed
US
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Mounting for discharge beans in well drilling bits
Assignee: H C SMITH OIL TOOL CO
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Filing: 1957-08-01
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Granted: 1960-08-23
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Expires: 1977-08-01
Abstract
No abstract record available.
Inventors
- 👤 Kenneth H Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:08
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1911659A
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US1143273A
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US1174575A
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US1957532A
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US2279129A
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US2408892A
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US2525667A
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US2760758A
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GB725257A
Cited
FR1113230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |