US3051532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pipe protector
Assignee: Individual
•
Filing: 1958-11-20
•
Granted: 1962-08-28
•
Expires: 1978-11-20
Abstract
No abstract record available.
Inventors
- 👤 Charles H Collett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:11
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)
US1298619A
Cited
US1994819A
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US1903467A
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US1907012A
Cited
US1889059A
Cited
GB470261A
Cited
US2197531A
Cited
US2286716A
Cited
US2636787A
Cited
US2887771A
Cited
US2855052A
Cited
US2897016A
Cited
US2959453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |