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Filter and method of making same

  • US 5,338,340 A
  • Filed: 06/30/1993
  • Issued: 08/16/1994
  • Est. Priority Date: 02/10/1990
  • Status: Expired due to Fees
First Claim
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1. An odor and grease or oil removing filter comprising:

  • a light colored, air-permeable, porous substrate for entrapping oil or grease aerosols and having opposed faces;

    a layer of particulate activated carbon distributed throughout one face of the substrate and extending into the substrate but essentially invisible from the opposite face and adhesively secured to the substrate, whereby one face of the substrate is a black color and the other face is a light color to exhibit accumulating oil or grease aerosols.

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