US3065793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for shutting off wells
Assignee: Page Oil Tools Inc
•
Filing: 1957-07-01
•
Granted: 1962-11-27
•
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
2026-11-07 18:09
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B2200/00; E21B2200/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2227538A
Cited
US2591087A
Cited
US2780290A
Cited
US2785755A
Cited
US2786535A
Cited
US2812822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-26 | 1966-05-28 | 1966-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-26 | 1970-05-28 | 1970-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-26 | 1974-05-28 | 1974-11-27 | $7700.00 | Window Closed / Lapsed |