US2985169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhalation-valve unit for a breathing mask
Assignee: Avox Systems Inc
•
Filing: 1957-09-09
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Granted: 1961-05-23
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Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 Richard J Elling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:50
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/10; B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2227; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; Y; Y10; Y10S; Y10S137/00; Y10S137/908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2362240A
Cited
US2614573A
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US2615463A
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US2764151A
Cited
US2758596A
Cited
US2839054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |