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US2825585A
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US
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Prestressed shrunk-fitted rotary drill collar and tool joint
Assignee: American Iron & Machine Works
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Filing: 1954-07-01
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Granted: 1958-03-04
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Claude L Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1517428A
Cited
US2160263A
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US2211179A
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US2641488A
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US2636753A
Cited
US2574081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |