Process of making a member with holes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 25, 1993
Issued Date -
N/A
app pub date -
Dec 21, 1990
filing date -
Oct 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Member of polymethylmethacrylate, polysulfone, polymer or a like material with a plurality of holes arranged in a predetermined, geometrical configuration. The holes are derived at through a procedure of repetitive drawing. Prior to the first drawing operation, each of the holes is filled with a material which is soluble to a certain chemical, yet drawable along with the base material. The member of material can be square, drawn to a reduced cross-sectional area as a square, the reduced cross-sectional members positioned with respect to each other and drawn again in a further operation, and repeated accordingly so that the cross-sectional area of each hole is reduced in proportion to each drawing step. Dependent upon the final drawing step, a subsequent member is provided which includes holes of a significantly reduced cross-sectional area. The member can be utilized as either a contact lens, an intracorneal inlay, an intraocular lens, a medical filter, or a like structure with small holes.
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