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US3029093A
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Pipe coupling embodying fluid pressure actuated locking means
Assignee: Willis Oil Tool Co
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Filing: 1957-06-03
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Granted: 1962-04-10
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Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Robert S Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:17
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/24; F16L37/244; F16L37/252; F16L29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309830A
Cited
US1232193A
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US1393908A
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US1430558A
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US2571641A
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US2712458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |