Patent US3373971A successfully refreshed from Google Patents.
US3373971A
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US
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Hydraulic gripper for derrick jack
Assignee: Hydranautics Corp
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Filing: 1966-02-01
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Granted: 1968-03-19
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Expires: 1986-02-01
Abstract
No abstract record available.
Inventors
- 👤 Henry B Chambers
- 👤 Clair W Tellefson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:34
CPC Classifications
B; B66; B66F; B66F1/00; B66F1/02; B66F1/025; E; E21; E21B; E21B15/00; E21B15/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |