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Patent US2921594A successfully refreshed from Google Patents.
US2921594A
Expired / Lapsed
US
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Breathing apparatus
Assignee: Individual
•
Filing: 1955-04-01
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Granted: 1960-01-19
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Expires: 1975-04-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Mayo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
A; A61; A61M; A61M16/00; A62; A62B; A62B9/00; A62B9/02; A62B9/022; A62B9/025; Y; Y10; Y10S; Y10S137/00; Y10S137/908; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7754; Y10T137/7756
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2399054A
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US2445359A
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US2452670A
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US2436522A
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US2579855A
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US2635691A
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US2774352A
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US2728340A
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US2766752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |