US2745685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient drill collar joint
Assignee: DRILL COLLAR SERVICE Co I
•
Filing: 1952-02-15
•
Granted: 1956-05-15
•
Expires: 1972-02-15
Abstract
No abstract record available.
Inventors
- 👤 Stanley C Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:00
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US419883A
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US812379A
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US1889869A
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US2045520A
Cited
US2062407A
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DE692061C
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US2244124A
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US2257335A
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US2505747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |