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US3011774A
Expired / Lapsed
US
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Air balanced oil well equipment
Assignee: Individual
•
Filing: 1958-02-21
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Granted: 1961-12-05
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Expires: 1978-02-21
Abstract
No abstract record available.
Inventors
- 👤 Charles M O'leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:46
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/14; F04B47/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1426057A
Cited
US2207226A
Cited
US2259021A
Cited
US2665901A
Cited
US2754847A
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US2745660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |