Patent US2855224A successfully refreshed from Google Patents.
US2855224A
Expired / Lapsed
US
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Lubricated conically tapered drill stem joint
Assignee: Reed Roller Bit Co
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Filing: 1951-05-28
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Granted: 1958-10-07
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Expires: 1971-05-28
Abstract
No abstract record available.
Inventors
- 👤 Elvin G Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:51
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/001; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/20408; Y10T74/20414
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |