Patent US2989880A successfully refreshed from Google Patents.
US2989880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tongs
Assignee: Individual
•
Filing: 1958-07-03
•
Granted: 1961-06-27
•
Expires: 1978-07-03
Abstract
No abstract record available.
Inventors
- 👤 Earl D Hesser
- 👤 Walter W Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:21
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)
US1218488A
Cited
US2618468A
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US2703221A
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US2650070A
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US2741460A
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US2737839A
Cited
US2760392A
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US2846909A
Cited
US2780950A
Cited
US2879680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |