Method for making lenses from a modified polymerization product

Details Method for making lenses from a modified polymerization product Method for making lenses from a modified polymerization product

1977-06-24

1979-06-12

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

3 13, 264342RE, 351160H, B29D 1100

Patent

active

041580303

ABSTRACT:
The method of making lenses for the eyes from an improved modified polymerization product of methyl methacrylate. The product is in the as-cast form from which satisfactory lenses can be made, but is improved in optical clarity and wetability by heat treating and shrinking the product in a linear direction and thickening the product in another direction prior to cutting the product for making the lenses. After cooling the lens blanks are cut and the lenses are made by conventional grinding.

REFERENCES:
patent: 2302918 (1942-11-01), Smith
patent: 3647736 (1972-03-01), Ewell
patent: 3651192 (1972-03-01), Erickson
patent: 3807398 (1974-04-01), Grucza
patent: 3839304 (1974-10-01), Hovey
patent: 3841985 (1974-10-01), O'Driscoll et al.
patent: 3966847 (1976-06-01), Seiderman
patent: 3978164 (1976-08-01), Le Boeuf et al.

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