Microfilter foil and method of producing same
First Claim
1. A microfilter foil of inorganic material having a filtering surface on one side, a plurality of discrete hollow protuberances extending from said surface, each said protuberance having a pore opening at a crest thereof and a pore channel extending therethrough with an increasing cross-section in a direction from said crest.
1 Assignment
0 Petitions
Accused Products
Abstract
The microfilter foil is made of an inorganic substance such as metal with opened pores. Each pore is formed with a channel which increases in cross-section from the crest so as to obviate clogging. The foil is produced by exposure of a photosensitive layer of paint or lacquer with the use of an interference pattern produced by monochromatic and coherent light. A skin of inorganic material is produced on the photosensitive layer and portions of the skin are thereafter removed from the coated teeth in order to produce the pores in the subsequently formed foil.
45 Citations
16 Claims
- 1. A microfilter foil of inorganic material having a filtering surface on one side, a plurality of discrete hollow protuberances extending from said surface, each said protuberance having a pore opening at a crest thereof and a pore channel extending therethrough with an increasing cross-section in a direction from said crest.
-
11. In combination
a microfilter foil of inorganic material having a filtering surface on one side, a plurality of discrete hollow protuberances extending from said surface, each said protuberance having a pore opening at a crest thereof and a pore channel extending therethrough with an increasing cross-section in a direction from said crest; - and
an open-pore support structure supporting said foil on a side opposite said one side and having pore openings of greater size than said pore openings of said foil.
- and
-
12. A method of producing a microfilter foil comprising the steps of
forming a photosensitive layer of a material selected from the group consisting of paint and lacquer on a substrate; -
exposing the photosensitive layer to an interference pattern produced with monochromatic and coherent light to form a relief surface having a plurality of discrete protuberances thereon; forming a skin of inorganic material on and over said protuberances of said relief surfaces; thereafter removing inorganic material from over said protuberances along with a portion of each protuberance to define perforations in said skin; and removing the remainder of the photosensitive layer to obtain a foil of inorganic material with a plurality of discrete protuberances, each said protuberance having a pore opening in a crest thereof. - View Dependent Claims (13, 14, 15, 16)
-
Specification