Patent US2391877A successfully refreshed from Google Patents.
US2391877A
Expired / Lapsed
US
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Respiration apparatus
Assignee: Individual
•
Filing: 1943-11-29
•
Granted: 1946-01-01
•
Expires: 1963-11-29
Abstract
No abstract record available.
Inventors
- 👤 Alvin M Cahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:06
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/021; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7758; Y10T137/7761; Y10T137/7781; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-31 | 1949-07-02 | 1950-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-31 | 1953-07-02 | 1954-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-31 | 1957-07-02 | 1958-01-01 | $7700.00 | Window Closed / Lapsed |