Patent US3425757A successfully refreshed from Google Patents.
US3425757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split drill pipe protector
Assignee: Individual
•
Filing: 1968-01-17
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Granted: 1969-02-04
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Expires: 1988-01-17
Abstract
No abstract record available.
Inventors
- 👤 Burt Stanley Minor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:12
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1965998A
Cited
US2002893A
Cited
US2251428A
Cited
US2380715A
Cited
US2897016A
Cited
US3051532A
Cited
US3054646A
Cited
US3094360A
Cited
US3147963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |