Molding toric contact lenses using a directed stream of gas

Details Molding toric contact lenses using a directed stream of gas Molding toric contact lenses using a directed stream of gas

1985-01-11

1987-01-13

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Rotational molding

264 11, 264 85, 264310, 264500, B29D 1100

Patent

active

046363386

ABSTRACT:
The lens is molded in a rotating concave lens mold. Liquid lens monomer is placed in the concave mold and a controlled stream of gas from a narrow opening extending across the lens and positioned over the lens center shapes the concave surface to a toric. The lens mold and the gas nozzle rotate in synchronization until the lens monomer is polymerized.

REFERENCES:
patent: 2302020 (1942-11-01), Frederick, Jr.
patent: 3454686 (1969-07-01), Jones
patent: 3660545 (1972-05-01), Wichterle
patent: 3691263 (1972-09-01), Stoy et al.
patent: 3699089 (1972-10-01), Wichterle et al.
patent: 4459246 (1984-07-01), Neefe

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