Patent US3050132A successfully refreshed from Google Patents.
US3050132A
Expired / Lapsed
US
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Fluid pressure operated shut-off valve for wells
Assignee: Page Oil Tools Inc
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Filing: 1957-07-01
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Granted: 1962-08-21
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:29
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; E21B34/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727
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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |