Patent US2551653A successfully refreshed from Google Patents.
US2551653A
Expired / Lapsed
US
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Oxygen mask for pressure breathing
Assignee: Individual
•
Filing: 1946-02-13
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Granted: 1951-05-08
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Expires: 1966-02-13
Abstract
No abstract record available.
Inventors
- 👤 William A Wildhack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:37
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US680419A
Cited
US1508970A
Cited
US1509319A
Cited
US1691648A
Cited
GB292531A
Cited
US2168695A
Cited
US2453475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |