Patent US3435822A successfully refreshed from Google Patents.
US3435822A
Expired / Lapsed
US
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Breathing apparatus with fluid diode valve
Assignee: RTX Corp
•
Filing: 1965-06-29
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Granted: 1969-04-01
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Expires: 1985-06-29
Abstract
No abstract record available.
Inventors
- 👤 Hermann Ziermann
- 👤 Robert E Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:23
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/14; A61M16/16; A61M16/08; A61M16/0816; A61M16/0841; A61M16/0858; A62; A62B; A62B7/00; A61M16/0057; A61M16/0063; Y; Y10; Y10S; Y10S128/00; Y10S128/10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2229; Y10T137/2234
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3068856A
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US3030979A
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US3198214A
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US3244189A
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US3280832A
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US3292623A
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US3389698A
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US3379194A
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US3368555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |