US2939281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow controlling valve system
Assignee: North American Aviation Corp
•
Filing: 1954-03-01
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Granted: 1960-06-07
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Expires: 1974-03-01
Abstract
No abstract record available.
Inventors
- 👤 John R Conyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:51
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/42; F02K9/44; F02K9/50; F02K9/56; F02K9/58; F02K9/95; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1782
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |