Patent US3802286A successfully refreshed from Google Patents.
US3028873A
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US
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Non-rebreathing valve
Assignee: Sierra Engineering Co
•
Filing: 1956-11-19
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Granted: 1962-04-10
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Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Bob A Kindred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:26
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/20; A61M16/208; A61M16/22; Y; Y10; Y10S; Y10S137/00; Y10S137/908; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/8158; Y10T137/8359
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US46902A
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US804272A
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US1625419A
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FR766487A
Cited
DE661034C
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US2295774A
Cited
US2388533A
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FR910738A
Cited
GB604558A
Cited
FR1127006A
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US2823670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |