US4412537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fresh air breathing mask with exterior heat exchanger
Assignee: Individual
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Filing: 1981-07-27
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Granted: 1983-11-01
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Expires: 2001-07-27
Abstract
Abstract A typical embodiment of the invention provides a sturdy, lightweight, inexpensive and comfortable warmer for fresh breathing air. An heat exchanger that is sufficiently flexible to conform with the shape of a wearer's scalp is secured to the wearer's head by means of a pullover cap. In this way the heat exchanger takes advantage of the great heat dissipating capabilities of the human head in order to warm fresh breathing air on its way from the atmosphere to the wearer's nose mask.
Inventors
- 👤 Howard L. Tiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:21
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/1075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A breathing mask for wear on the head comprising a tubular fresh air inlet, a heat exchanger in fluid communication with said fresh air inlet, said heat exchanger being sufficiently flexible to conform with the scalp and being generally thin in order to absorb heat from the scalp, a flexible tube in fluid communication with said heat exchanger, and a check valve for selectively interrupting said flexible tube fluid communication to establish air flow only from said heat exchanger through said flexible tube, a nose mask in fluid communication with said tube and said check valve, another check valve for establishing fluid communication with said mask, a discharge tube for providing fluid communication selectively from said mask and directly to the atmosphere through said another check valve, a cap for securing said heat exchanger to the head, and means for securing said mask to the head.
Claim 2
Dependent Claim
146 words
A breathing mask for wear on the head comprising a tubular fresh air inlet, a heat exchanger in fluid communication with said fresh air inlet, said heat exchanger being sufficiently flexible to conform with the scalp and being generally thin in order to absorb heat from the scalp, a flexible tube in fluid communication with said heat exchanger, and a check valve for selectively interrupting said flexible tube fluid communication to establish air flow only from said heat exchanger through said flexible tube, a nose mask in fluid communication with said tube and said check valve, another check valve for establishing fluid communication with said mask, a discharge tube for providing fluid communication selectively from said mask and directly to the atmosphere through said another check valve, a cap for securing said heat exchanger to the head, and means for securing said mask to the head.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |