Liquid purification or separation – Filter – Resting on supporting receiver – e.g. – portable
Patent
1975-08-06
1978-03-21
Lutter, Frank W.
Liquid purification or separation
Filter
Resting on supporting receiver, e.g., portable
99295, 99323, 210481, 210482, 210484, 210485, 210489, 426433, B01D 2328, B01D 3528
Patent
active
040802990
ABSTRACT:
A coffee filter for coffee pots comprising a container, and a filtering element is disclosed. The container comprises a bottom surface having a plurality of openings and a lateral surface extending from the bottom surface around the periphery of the bottom surface. A plurality of axial ribs are connected to the inside of the lateral surface. The axial ribs are spaced equidistantly about the inside of the lateral surface. Each of these ribs has an inclined edge surface such that the surface defined by the inclined edges of the axial ribs is in the shape of an inverted truncated cone. The bottom edges of the axial ribs terminate in a supporting ramp which is a radial projection extending from the inclined edge of each axial rib. The filtering element is supported, and rests upon, the supporting ramp. The filtering element comprises a unitary filter made up of a pair of frames having a circular cross-section and a filtering sheet comprising a fine mesh material of circular shape with a diameter greater than the diameter of the frames. Both the frames and the filtering sheet are plastic. The filtering sheet is placed in the container and rest on the supporting rims. The portion of the filtering sheet that extends beyond the frame is bent upwardly to form a filtering wall which is supported by the inclined edges of the axial ribs.
REFERENCES:
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patent: 3651947 (1972-03-01), Schollhamer
patent: 3849312 (1974-11-01), Wecker
patent: 3854389 (1974-12-01), Hillemann
Lutter Frank W.
Sever Frank
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