US2765147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill pipe shock absorber
Assignee: Individual
•
Filing: 1952-02-08
•
Granted: 1956-10-02
•
Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 John A Vertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:36
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US75814A
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US1960688A
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US2199926A
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US2212153A
Cited
US2325132A
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US2560644A
Cited
US2502790A
Cited
US2620165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |