Method and apparatus for removing a contact lens from a plastic

Details Method and apparatus for removing a contact lens from a plastic Method and apparatus for removing a contact lens from a plastic

1989-08-23

1990-03-20

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 23, 264313, 264334, 425440, 425808, B29D 1100

Patent

active

049099698

ABSTRACT:
Fabrication of contact lenses whereby the yield of lenses removed from plastic casting molds is significantly increased. In fabricating contact lenses where a lens is initially formed in a plastic casting mold, the mold is compressed to a degree sufficient to initiate permanent deformation of the mold material, in progressive steps, incrementally decreasing in diameter from a starting diameter substantially larger than the diameter of the molded lens, until the lens self-detaches from the mold.

REFERENCES:
patent: 4042652 (1977-08-01), Feneberg
patent: 4155962 (1979-05-01), Neefe
patent: 4457880 (1984-07-01), Neefe

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