Injection molding of contact lenses

Details Injection molding of contact lenses Injection molding of contact lenses

1979-04-04

1981-03-03

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

2643288, 26432815, 425808, B29D 1100

Patent

active

042540658

ABSTRACT:
The present invention relates to lenses and more particularly relates to the method of forming prescription contact lenses of the single vision, bicurve, lenticular, bifocal and other types by injection molding. The lens is formed from a blank having a cylindrical configuration with a concave or convex surface. The concave or convex surface forms a surface such as the base curve of the completed lens minimizing finishing operations. The lens blanks are supplied to the practitioners in a series having a completed or substantially completed curved surface. The lenses are formed by injection molding closely controlling parameters such as injection pressure, time, and temperature to avoid internal stress in the lens.

REFERENCES:
patent: 2178873 (1939-11-01), Feinbloom
patent: 2369758 (1945-02-01), Sheldon
patent: 2443826 (1948-06-01), Johnson
patent: 3221083 (1965-11-01), Crandon
patent: 3227507 (1966-01-01), Feinbloom
patent: 3662040 (1972-05-01), Usbach et al.
patent: 3760045 (1973-09-01), Thiele et al.
patent: 3784657 (1974-01-01), Hutchinson et al.
patent: 3948871 (1976-04-01), Butterfield, Jr.
patent: 4008031 (1977-02-01), Weber
"Injection Molding," W.O. Elliot, Modern Plastics Encyclopedia 1968, vol. 45, No. 1A, 7/67 McGraw Hill NYC, pp. 720, 721, 733.

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