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Face mask

  • US 4,850,347 A
  • Filed: 03/20/1987
  • Issued: 07/25/1989
  • Est. Priority Date: 06/09/1980
  • Status: Expired due to Term
First Claim
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1. A method of making a face mask to be worn upon the face of a wearer and for providing filtering including the following steps,providing at least one layer of flexible plastic material formed from openwork flexible plastic material for providing a plurality of perforations for allowing for the free passage of air through the openwork plastic,providing a layer of filter material for filtering impurities in the air,providing male and female molding members having a mold configuration conforming generally to the contours of the face of the wearer,maintaining the molding members at a cold temperature,preheating the at least one layer of openwork flexible plastic material to a hot temperature sufficient to mold the plastic material to a desired configuration,moving the preheated layer of openwork flexible plastic material and the layer of filter material between the cold male and female molding members, andpressing the male and female molding members together to form the face mask to the desired configuration by molding the at least one layer of openwork flexible plastic material to form a support layer to carry the layer of filter material while at the same time cooling the preheated layer of openwork flexible plastic material sufficiently so as not to damage the layer of filter material.

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