USRE27284E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded drill rod element
Assignee: —
•
Filing: 1970-04-13
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Granted: 1972-02-15
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Expires: 1990-04-13
Abstract
Abstract A DRILL ROD COUPLING COMPRISING A THREADED ROD AND A MATCHING THREADED SLEEVE, THE ROD THREADS HAVING AT LEAST TWO STARTS AND FLANK ANGLES ADJACENT THE CRESTS OF AT LEAST 45* WHICH GRADUALLY INCREASE TOWARD THE BASE, WHICH LATTER HAS A CONCAVE SHAPE WITH A RADIUS GREATER THAN THE DEPTH OF THE THREAD, THE FLANKS OF THE THREAD BEING SYMMETRICAL AND THE CRESTS BEING BEVELLED, AND SPACED FROM THE BOTTOMS OF THE SLEEVE THREADS.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/005; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426; F; F16; F16B; F16B33/00; F16B33/02; B23B2260/00; B23B2260/138; B25; B25D; B25D2217/00; B25D2217/003; B25D2217/0034
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |