Respirators

Details Respirators Respirators

1981-06-22

1983-11-29

Howell, Kyle L.

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

12820612, 12820616, D29 8, A62B 710

Patent

active

044175752

ABSTRACT:
The present invention relates to a filtering facepiece made from flexible filtering sheet material.
The facepiece is made from a flat pocket 100 of filtering sheet material having opposed side walls 105 and 106, a generally tapering shape with an open end 104 at the larger end and a closed end 101 at the smaller end. The edge of the pocket at the closed end is outwardly bowed, e.g. defined by intersecting straight lines and/or curved lines, and the closed end is provided with fold lines 107 defining a surface which is folded inwardly of the closed end of the pocket to define a generally conical inwardly extending recess 108 for rigidifying the pocket against collapse against the face of the wearer on inhalation.

REFERENCES:
patent: Re29613 (1978-04-01), Kropfhammer
patent: 1292096 (1919-01-01), Schwartz
patent: 1523884 (1925-01-01), Leduc
patent: 1868281 (1932-07-01), Falkson
patent: 3971369 (1976-07-01), Aspelin et al.
patent: 4248220 (1981-02-01), White

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