US3908649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Personal filter respirator
Assignee: Draegerwerk AG and Co KGaA
•
Filing: 1973-12-03
•
Granted: 1975-09-30
•
Expires: 1993-12-03
Abstract
Abstract A filter respirator which is particularly useful for self protection against carbon monoxide comprises a filter casing which is filled with a catalyst material. A mouthpiece assembly includes a shoulder portion which is engaged on the filter casing for connecting the casing for flow from the opposite end through the casing and through the shoulder to an internal chamber of the mouthpiece which comprises a heat exchanger which is advantageously filled with a material of low thermal conductivity such as wire, chips, mesh, grains, pellets, pipe cuttings or similar material. The air which is inhaled is directed through the filter casing and the heat exchanger chamber of the mouthpiece to the mouthpiece and in so doing it is evaporated on the surface of the filling material before it enters a person''s respiratory system and is then discharged backwardly through the mouthpiece through an outlet valve.
Inventors
- 👤 Wolfgang Eckstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:54
CPC Classifications
A; A62; A62B; A62B19/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A FILTER RESPIRATOR FOR SELF-PROTECTION AGAINST CARBON MONOXIDE AND WHICH HAS A CATALYST PORTION WHICH OPERATES AT HIGH TEMPERATURES AND A MOUTHPIECE CASING PORTION WHICH IS OPERABLE TO COOL RESPIRATED AIR BY THE EVAPORATION OF THE USER''S SALIVA, COMPRISING A CATALYST CASING HAVING AN AIR INLET AND AN INTERVAL PASSAGE FILLED WITH A CATALYST MATERIAL, AND A MOUTHPIECE CASING CONNECTED TO SAID CATALYST CASING WITH PASSAGE MEANS FOR A FLOW OF AIR FROM THE CATALYST CASING THROUGH SAD MOUTHPIECE CASING, SAID MOUTHPIECE PORTON CASING CONTAINING AN INTERNAL HEAT EXCHANGER CHAMBER FILLED WITH A PLAZSTIC MATERIEL OF LOW THERMAL CONDUCTIVITY THROUGH WHICH THE INHALED AIR IS PASSED SO THAT THE SALIVA ADHERES TO THE MATERIAL AND THE SUBSEQUENT INHALED AIR IS COOLED BY THE EVAPORATION OF THE SALIVA.
Claim 2
Dependent Claim
127 words
A FILTER RESPIRATOR FOR SELF-PROTECTION AGAINST CARBON MONOXIDE AND WHICH HAS A CATALYST PORTION WHICH OPERATES AT HIGH TEMPERATURES AND A MOUTHPIECE CASING PORTION WHICH IS OPERABLE TO COOL RESPIRATED AIR BY THE EVAPORATION OF THE USER''S SALIVA, COMPRISING A CATALYST CASING HAVING AN AIR INLET AND AN INTERVAL PASSAGE FILLED WITH A CATALYST MATERIAL, AND A MOUTHPIECE CASING CONNECTED TO SAID CATALYST CASING WITH PASSAGE MEANS FOR A FLOW OF AIR FROM THE CATALYST CASING THROUGH SAD MOUTHPIECE CASING, SAID MOUTHPIECE PORTON CASING CONTAINING AN INTERNAL HEAT EXCHANGER CHAMBER FILLED WITH A PLAZSTIC MATERIEL OF LOW THERMAL CONDUCTIVITY THROUGH WHICH THE INHALED AIR IS PASSED SO THAT THE SALIVA ADHERES TO THE MATERIAL AND THE SUBSEQUENT INHALED AIR IS COOLED BY THE EVAPORATION OF THE SALIVA.
Claim 3
Dependent Claim
127 words
A filter respirator for self-protection against carbon monoxide and which has a catalyst portion which operates at high temperatures and a mouthpiece casing portion which is operable to cool respirated air by the evaporation of the user''s saliva, comprising a catalyst casing having an air inlet and an internal passage filled with a catalyst material, and a mouthpiece casing connected to said catalyst casing with passage means for a flow of air from the catalyst casing through said mouthpiece casing, said mouthpiece portion casing containing an internal heat exchanger chamber filled with a glass material of low thermal conductivity through which the inhaled air is passed so that the saliva adheres to the material and the subsequent inhaled air is cooled by the evaporation of the saliva.
Claim 4
Dependent Claim
127 words
A filter respirator for self-protection against carbon monoxide and which has a catalyst portion which operates at high temperatures and a mouthpiece casing portion which is operable to cool respirated air by the evaporation of the user''s saliva, comprising a catalyst casing having an air inlet and an internal passage filled with a catalyst material, and a mouthpiece casing connected to said catalyst casing with passage means for a flow of air from the catalyst casing through said mouthpiece casing, said mouthpiece portion casing containing an internal heat exchanger chamber filled with a glass material of low thermal conductivity through which the inhaled air is passed so that the saliva adheres to the material and the subsequent inhaled air is cooled by the evaporation of the saliva.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |