US2676820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collar
Assignee: Reed Roller Bit Co
•
Filing: 1951-09-24
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Granted: 1954-04-27
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Expires: 1971-09-24
Abstract
No abstract record available.
Inventors
- 👤 Elvin G Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:15
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16; E21B17/02; E21B17/04; E21B17/042; F; F16; F16L; F16L55/00; Y; Y10; Y10S; Y10S285/00; Y10S285/916
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) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |