Patent US3458922A successfully refreshed from Google Patents.
US3458922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing a drill pipe protector means
Assignee: Individual
•
Filing: 1967-06-13
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Granted: 1969-08-05
•
Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 Herman J Schellstede
- 👤 Thomas M Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:21
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1881160A
Cited
CH202300A
Cited
US2259232A
Cited
US2220773A
Cited
US2232593A
Cited
US2258913A
Cited
US3195229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |