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Gas separating and venting filter

  • US 4,190,426 A
  • Filed: 11/30/1977
  • Issued: 02/26/1980
  • Est. Priority Date: 11/30/1977
  • Status: Expired due to Term
First Claim
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1. A gas separating and venting filter comprising:

  • a plastic heat-deformable plastic housing having walls defining an interior chamber, inlet opening means in said housing for conveying fluid into said chamber, one of said walls comprising liquid-wetting filter means for passing liquid only therethrough, outlet means downstream of said liquid-wetting filter means for conveying liquid therefrom, vent opening means in said housing communicating between the outside of said housing and said interior chamber to vent gas from said chamber, and planar liquid-repellent filter means covering said vent opening means and having a peripheral edge portion overlying said housing and sealed thereto to permit the passage of gas but to prevent liquid from escaping through said vent opening means, said liquid-repellent filter means comprising a plastic liquid-repellent filter membrane with a plastic fibrous backing disposed between said membrane and said housing, said filter means having a higher melt temperature than said housing, said seal between said filter means and said housing comprising a continuous mechanical bond formed between said fibrous backing and said housing in which portions of said housing fill the interstices in portions of said fibrous backing.

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