Patent US3541897A successfully refreshed from Google Patents.
US3541897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tubing tongs
Assignee: Individual
•
Filing: 1968-06-07
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Granted: 1970-11-24
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Expires: 1988-06-07
Abstract
No abstract record available.
Inventors
- 👤 Herbert D Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:17
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/161; E21B19/164
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2618468A
Cited
US2582724A
Cited
US2879680A
Cited
US2989880A
Cited
US3025733A
Cited
US3059512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |