Patent US2981275A successfully refreshed from Google Patents.
US2981275A
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US
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Valves for reducing gaseous pressure
Assignee: Walter Kidde Ltd
•
Filing: 1957-01-10
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Granted: 1961-04-25
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Expires: 1977-01-10
Abstract
No abstract record available.
Inventors
- 👤 Young David Herbert
- 👤 Clay-Smith Laurence Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:58
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0644; G05D16/0663; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/261; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7822; Y10T137/7823; Y10T137/7826; Y10T137/794; Y10T137/8122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US510635A
Cited
US2731975A
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US2089144A
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FR838628A
Cited
US2605077A
Cited
US2615287A
Cited
US2739611A
Cited
FR1083517A
Cited
US2819728A
Cited
US2906288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |