Patent US3396723A successfully refreshed from Google Patents.
US3396723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus with periodic volume change
Assignee: Individual
•
Filing: 1966-03-17
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Granted: 1968-08-13
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Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Klaus Freytag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:25
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0057; A61M16/0081; A61M16/021; A61M16/0003; A61M16/0009; A61M16/0075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A BREATHING APPARATUS COMPRISING A HOUSING, A BREATHING BAG IN SAID HOUSING, PRESSURE MEANS FOR PUTTING SAID BAG UNDER GREATER THAN OR LESS THAN ATMOSPHERIC PRESSURE TO EXPAND OR CONTRACT SAID BAG, MOVABLE STOP MEANS FOR LIMITING THE NORMAL MAXIMUM EXPANSION OF SAID BAG, PRESSURE COUNTING MEANS FOR RELEASING SAID STOP MEANS AFTER A PREDETERMINED NUMBER OF GREATER THAN ATMOSPHERIC PRESSURES APPLIED TO SAID BAG SO THAT SAID BAG IS EXPANDED TO MORE THAN SAID MAXIMUM EXPANSION DURING A FOLLOWING LESS THAN ATMOSPHERIC PRESSURE ON SAID BAG, AND MEANS FOR COMMUNICATNG SAID BAG WITH A PATIENT SO THAT A DEEP BREATH IS PERIODICALLY FORCED INTO THE LUNGS OF THE PATIENT.
Claim 2
Dependent Claim
110 words
A BREATHING APPARATUS COMPRISING A HOUSING, A BREATHING BAG IN SAID HOUSING, PRESSURE MEANS FOR PUTTING SAID BAG UNDER GREATER THAN OR LESS THAN ATMOSPHERIC PRESSURE TO EXPAND OR CONTRACT SAID BAG, MOVABLE STOP MEANS FOR LIMITING THE NORMAL MAXIMUM EXPANSION OF SAID BAG, PRESSURE COUNTING MEANS FOR RELEASING SAID STOP MEANS AFTER A PREDETERMINED NUMBER OF GREATER THAN ATMOSPHERIC PRESSURES APPLIED TO SAID BAG SO THAT SAID BAG IS EXPANDED TO MORE THAN SAID MAXIMUM EXPANSION DURING A FOLLOWING LESS THAN ATMOSPHERIC PRESSURE ON SAID BAG, AND MEANS FOR COMMUNICATNG SAID BAG WITH A PATIENT SO THAT A DEEP BREATH IS PERIODICALLY FORCED INTO THE LUNGS OF THE PATIENT.
References Cited (Backward Citations)
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Cited
US2770231A
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US2972345A
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US2969789A
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US3033195A
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US3033196A
Cited
US3068857A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |