Respirators
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United States of America Patent
Stats
-
Dec 13, 1983
Issued Date -
N/A
app pub date -
Jun 22, 1981
filing date -
Jul 3, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a respirator of the type called a filtering facepiece which is made from a flat pocket of flexible filtering sheet material having a generally tapering shape with an open edge at the larger end of the pocket and a closed end at the smaller end of the pocket. The closed end of the pocket is formed with fold lines defining a generally quadrilateral surface comprising triangular surfaces which are folded to extend inwardly of the pocket, the triangular surfaces facing each other and being, in use, relatively inclined to each other.
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