US3445144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe protector
Assignee: HELMRICH AND PAYNE Inc
•
Filing: 1967-03-20
•
Granted: 1969-05-20
•
Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 James H Mcbrien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:12
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)
US1608873A
Cited
US1889060A
Cited
US2277002A
Cited
US3051532A
Cited
US3094360A
Cited
US3197262A
Cited
US3227498A
Cited
US3292708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |