US3074767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear-resisting drill pipe coupling
Assignee: American Iron & Machine Works
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Filing: 1959-12-02
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Granted: 1963-01-22
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Expires: 1979-12-02
Abstract
No abstract record available.
Inventors
- 👤 Rosenberg Edgar L Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:38
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1085
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
51 words
A DRILL PIPE COUPLING HAVING A BAND OF HARD FACING THEREAROUND, SAID BAND COMPRISING A PLURALITY OF ANNULAR ROWS OF SEPARATELY PREFORMED INTERLOCKING TILES OF HARD FACING MATERIAL, SAID TILES BEING FORMED OF SINTERED TUNGSTEN CARBIDE AND SUPPORTED BY A METALLIC BONDING MATERIAL WITHIN AN ANNULAR GROOVE FORMED IN SAID COUPLING.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |