Patent US2878807A successfully refreshed from Google Patents.
US2878807A
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Open circuit breathing apparatus
Assignee: LA SPIROTECHNIQUE SA
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Filing: 1955-02-07
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Granted: 1959-03-24
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Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Gagnan Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:34
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; A62B9/022; B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2227; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/2036; Y10T137/7722; Y10T137/7754
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |