US2820435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive control device
Assignee: RTX Corp
•
Filing: 1952-11-29
•
Granted: 1958-01-21
•
Expires: 1972-11-29
Abstract
No abstract record available.
Inventors
- 👤 Richard J Coar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:37
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/15; F02K1/16; F02K1/17; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606; Y10T137/9464
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2146176A
Cited
US1199036A
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US1880727A
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US1987505A
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US2125949A
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US2250344A
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US2285540A
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US2480621A
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US2454038A
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GB587558A
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US2373167A
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US2516449A
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US2521477A
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US2677233A
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US2683349A
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US2625136A
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US2687273A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |