Patent US3313614A successfully refreshed from Google Patents.
Patent US2885225A successfully refreshed from Google Patents.
US2885225A
Expired / Lapsed
US
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Drill pipe coupling having particular thread formations
Assignee: DRILCO OIL TOOLS Inc
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Filing: 1955-02-17
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Granted: 1959-05-05
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Expires: 1975-02-17
Abstract
No abstract record available.
Inventors
- 👤 Rollins Henry Moak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:45
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/001; F16L15/004; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |