Patent US2798747A successfully refreshed from Google Patents.
US2798747A
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Tubing-head stud lock
Assignee: Shaffer Tool Works
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Filing: 1954-05-07
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Granted: 1957-07-09
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Expires: 1974-05-07
Abstract
No abstract record available.
Inventors
- 👤 Leland S Auer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:58
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; F; F16; F16B; F16B2200/00; F16B2200/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2090956A
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US2077507A
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US2178549A
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US2312487A
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US2593193A
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US2472466A
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US2647774A
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US2666829A
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US2670225A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |