Novel filter and method of making same

Details Novel filter and method of making same Novel filter and method of making same

1976-07-14

1978-02-21

Lutter, Frank W.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

93 1D, 99306, 210508, 428153, B01D 2706, B01D 2906

Patent

active

040751074

ABSTRACT:
The invention relates to filter cups adapted for use in Melitta style coffee makers made of a unitary sheet of filter paper having integral fluted sides flaring outwardly from a stationary bottom and to a method and apparatus for making the same. The apparatus comprises complementary die members adapted to cut and flute the filter discs having central apertures, one of which is affixed to a heating and drying tube having the same diameter as the aperture. A plunger having a stretching head is passed through the other aperture to push the cut and formed filter discs into the heating and drying tube and at the same time to stretch the central portion to form a dish-shaped bottom having integral fluted sides flaring outwardly therefrom.

REFERENCES:
patent: 733728 (1903-07-01), Mauser
patent: 2131438 (1938-09-01), Jensen
patent: 2210114 (1940-08-01), Doble
patent: 2234397 (1941-03-01), Bentz
patent: 3374897 (1968-03-01), Martin
patent: 3490356 (1970-01-01), Peterson et al.
patent: 3512458 (1970-05-01), Eme
patent: 3550421 (1970-12-01), Stakel
patent: 3597222 (1971-08-01), Kalemba

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