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Filter paper cup for a percolator and process for making the same

  • US 4,094,234 A
  • Filed: 05/13/1976
  • Issued: 06/13/1978
  • Est. Priority Date: 05/13/1976
  • Status: Expired due to Term
First Claim
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1. In a percolator for brewing coffee comprising a cylindrical basket concentric with a tubular wand, the combination therewith of a filter paper cup having a flat annular bottom coextensive with and lying flat on the bottom of said basket and having an integral upstanding steam and heat-set sidewall only at the outer periphery of said annular bottom, said upstanding sidewall being fluted with accordian pleat-type flutes and said flutes being under compression by the fact that said upstanding sidewall normally flares outwardly when unconfined by said basket, but is constrained to a vertical position by said basket, in which the filter paper is composed essentially of bleached cellulose fiber from chemically processed wood pulp, is uncalendered, is unsized, is creped from about 6 to about 15 percent, and has a basis weight between about 28 and about 40 pounds, in which the sidewalls of the filter cup have at least 1 flute every 15°

  • , and in which said flutes are steam and heat set by heating the cups to a temperature of about 400°

    to 420°

    F to a moisture content between about 3 and about 6 percent while the sidewall is constrained in a cylindrical position, and substantially only the outermost apices of said flutes are substantially entirely in contiguous relationship with the inner wall of said basket into which said paper filter cup is placed.

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