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Novel filter and method of making same

  • US 4,075,107 A
  • Filed: 07/14/1976
  • Issued: 02/21/1978
  • Est. Priority Date: 07/14/1976
  • Status: Expired due to Term
First Claim
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1. A seamless filter cupcomprising a unitary sheet of filter paper having integral fluted side portions flaring outwardly from a dish-shaped bottom, in which the dish-shaped bottom has parallel side edges and arcuate end edges, and in which the dish-shaped bottom has substantially planar side portions which converge from said parallel side edges to a center line which is shorter than said parallel side edges and is parallel thereto, and having a mirror image symmetry about its longitudinal, transverse, and perpendicular axes.

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