04300549 is referenced by 52 patents and cites 3 patents.

A face mask comprising a pleated laminate having means to secure said laminate over the nose and mouth of the wearer, said laminate comprising a first outer layer of heat sealable facing material, a second inner layer of filtration media, and a third innermost layer of heat sealable facing material, the laminate being folded to create one pleat therein that extends across the entire laminate, each end of the pleat being secured together at the edges of the laminate and the folded edge of the pleat being heat sealed along substantially its entire length securing together the three layers of laminate, and reinforcing the pleat edge such that when the pleat is open, the reinforced pleat edge maintains the laminate away from the mouth and nose of the wearer when worn.

Title
Operating room face mask
Application Number
6/109948
Publication Number
4300549
Application Date
January 7, 1980
Publication Date
November 17, 1981
Inventor
Duane A Parker
North Plainfield
NJ, US
Assignee
Surgikos
NJ, US
IPC
A62B 7/10
View Original Source