Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1977-09-21
1979-02-27
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264342R, 264344, B29D 1100
Patent
active
041419413
ABSTRACT:
Producing from a single contact lens casting mold, lenses of a number of different sizes by including in the casting precursor for each lens, a controlled amount of an extractable diluent of low volatility which is extracted after casting to cause the resulting lens to shrink a calculable amount. Variations in amounts are used to produce corresponding variations in sizes of cast and extracted lenses.
REFERENCES:
patent: 2976576 (1961-03-01), Wichterle et al.
patent: 3220960 (1965-11-01), Wichterle et al.
patent: 3350216 (1967-10-01), McVannel et al.
patent: 3819782 (1974-06-01), Irie
patent: 4042652 (1977-08-01), Feneberg
American Optical Corporation
Berkenstock, Jr. H. R.
Duggan Jeremiah J.
Lowe James B.
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