Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer
Patent
1990-12-21
1993-05-25
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Composite or multiple layer
264145, 156155, 156229, 156250, 156264, 156296, B29D 1100
Patent
active
052137210
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.
REFERENCES:
patent: 3899315 (1975-08-01), Siegmund
patent: 4065046 (1977-12-01), Roberts et al.
patent: 4127398 (1978-11-01), Singer, Jr.
patent: 4157213 (1979-06-01), Phillips
patent: 4624669 (1986-11-01), Grendahl
patent: 4862575 (1989-09-01), Shirai et al.
Frenchick Grady J.
Kuhns Allan R.
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