Patent US4236912A successfully refreshed from Google Patents.
US4136691A
Expired / Lapsed
US
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Respiration mask
Assignee: Kontekla Oy
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Filing: 1977-04-08
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Granted: 1979-01-30
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Expires: 1997-04-08
Abstract
Abstract A respiration mask comprising a mask portion and a heat exchanger through which inhalation and exhalation air flows for the recovery of humidity and humidity contained in the exhalation air. The heat exchanger consists a continuous strip of wire netting wound helically to form a cylindrical netting roll comprising several turns. The flow of air takes place radially through the netting roll.
Inventors
- 👤 Olavi A. Ebeling
- 👤 Risto W. Lunden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:15
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/1045
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A respiration mask comprising a mask portion for covering the mouth and nose of a person, said mask portion having a respiration opening therein, and a heat exchanger through which inhalation and exhalation air flows for the recovery of the heat and humidity contained in the exhalation air and for the transfer thereof to the inhalation air, said heat exchanger including a pile of superimposed woven wire nettings formed from at least one continuous strip of wire netting wound helically to form a cylindrical netting roll comprising several turns, said netting roll at one axial end being connected to said respiration opening in the mask portion and means closing the other end of said roll so that the flow of air takes place radially through the netting roll in alternately opposite directions during inhalation and exhalation.
Claim 2
Dependent Claim
136 words
A respiration mask comprising a mask portion for covering the mouth and nose of a person, said mask portion having a respiration opening therein, and a heat exchanger through which inhalation and exhalation air flows for the recovery of the heat and humidity contained in the exhalation air and for the transfer thereof to the inhalation air, said heat exchanger including a pile of superimposed woven wire nettings formed from at least one continuous strip of wire netting wound helically to form a cylindrical netting roll comprising several turns, said netting roll at one axial end being connected to said respiration opening in the mask portion and means closing the other end of said roll so that the flow of air takes place radially through the netting roll in alternately opposite directions during inhalation and exhalation.
Claim 3
Dependent Claim
33 words
A respiration mask as claimed in claim 1, wherein an empty axial space is formed inside the netting roll, said space accomodating additional turns resulting from an elongation of the wire netting strip.
Claim 4
Dependent Claim
35 words
A respiration mask as claimed in claim 1 wherein said one end of the netting roll is provided with an annular fastener detachably connected to the mask portion at the location of said respiration opening.
Claim 5
Dependent Claim
36 words
A respiration mask as claimed in claim 1 wherein said means closing said other end of the netting roll includes a closing plate fastened by means of vulkanization to the outer edges of the netting turns.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |