US3361448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium alloy drill rod assembly with ceramic coated coupling member
Assignee: Dominion Magnesium Ltd
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Filing: 1965-09-27
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Granted: 1968-01-02
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Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 Harold G Warrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/006; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A DRILL ROD ASSEMBLY COMPRISING A PLURALITY OF DRILL ROD SECTIONS AND A COUPLING FOR CONNECTING SAID DRILL ROD SECTIONS, SAID DRILL ROD SECTIONS AND SAID COUPLING BEING ENTIRELY FORMED OF A MAGNESIUM ALLOY COMPRISING ZINC 4 TO 6%, ZIRCONIUM 0.5 TO 0.7%, AND BALANCE MAGNESIUM, SAID COUPLING HAVING THREADED END PORTIONS AND AN ANODIC FILM OF CERAMIC NATURE AND BEING HARDER AND MORE BRITTLE THAN SAID ALLOY EXTENDING OVER THE ENTIRE SURFACES OF SAID COUPLING INCLUDING SAID THREADED END PORTIONS THEREOF, AND A SEALING RESINOUS COATING COMPLETELY OVERLYING AND BONDED TO SAID FILM, EACH SAID DRILL ROD SECTION HAVING A THREADED END PORTION FOR THREADED ENGAGEMENT WITH ONE
Claim 2
Dependent Claim
109 words
A DRILL ROD ASSEMBLY COMPRISING A PLURALITY OF DRILL ROD SECTIONS AND A COUPLING FOR CONNECTING SAID DRILL ROD SECTIONS, SAID DRILL ROD SECTIONS AND SAID COUPLING BEING ENTIRELY FORMED OF A MAGNESIUM ALLOY COMPRISING ZINC 4 TO 6%, ZIRCONIUM 0.5 TO 0.7%, AND BALANCE MAGNESIUM, SAID COUPLING HAVING THREADED END PORTIONS AND AN ANODIC FILM OF CERAMIC NATURE AND BEING HARDER AND MORE BRITTLE THAN SAID ALLOY EXTENDING OVER THE ENTIRE SURFACES OF SAID COUPLING INCLUDING SAID THREADED END PORTIONS THEREOF, AND A SEALING RESINOUS COATING COMPLETELY OVERLYING AND BONDED TO SAID FILM, EACH SAID DRILL ROD SECTION HAVING A THREADED END PORTION FOR THREADED ENGAGEMENT WITH ONE
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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |