US2980138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable rate valve
Assignee: Lockheed Martin Corp
•
Filing: 1956-12-10
•
Granted: 1961-04-18
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 James I Detwciler
- 👤 Jr Forest O Riek
- 👤 Douglas G Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:10
CPC Classifications
F; F15; F15B; F15B19/00; F15B19/005; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86493; Y10T137/86501; Y10T137/86549; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86654
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US685510A
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US988945A
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US1644093A
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US2145383A
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US2314428A
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US2327046A
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US2313257A
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US2312941A
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US2345073A
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US2818881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |