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Filter

  • US 7,040,490 B2
  • Filed: 06/25/2003
  • Issued: 05/09/2006
  • Est. Priority Date: 12/29/2000
  • Status: Expired due to Term
First Claim
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1. A filter for a medium passing therethrough, comprising:

  • a filter body including a plurality of filter openings;

    said filter openings each having a passage cross-section; and

    said filter opening passage cross-sections vary automatically in response to a variable inherent in the medium passing therethrough, said filter openings being substantially screened or covered over by means whose position relative to said filter openings varies under the influence of the heat of said medium passing therethrough and said means including a perforated plate with openings somewhat longer than openings formed in a filter plate and said perforated plate is shifted under the influence of the heat of said medium passing therethrough by means of at least one element acting on said filter plate.

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