Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonmechanical aftertreatment
Patent
1990-08-31
1992-12-29
Schofer, Joseph L.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonmechanical aftertreatment
523106, 264 11, 264 14, B29D 1100
Patent
active
051749297
ABSTRACT:
A dimensionally stable hydrogel contact lens of polyvinyl alcohol having an equilibrium water content of between about 70 to about 80 weight percent, based upon the total swollen lens weight, said lens having been annealed in a mold essentially conforming to the contact lens dimensions under substantially ambient non-drying setting conditions in the presence of an aqueous-organic annealing promoter solvent, for a period of time substantially sufficient to reach annealing equilibrium.
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patent: 3408423 (1966-07-01), Friedman
patent: 4469837 (1984-09-01), Cattaneo
patent: 4559186 (1985-12-01), Lee
patent: 4619793 (1986-10-01), Lee
patent: 4874562 (1989-10-01), Hyon
patent: 4966924 (1990-10-01), Hyon et al.
Ajello Ellen M.
Janssen Robert A.
Lee Ping I.
Ciba-Geigy Corporation
Hervey William G.
McC. Roberts Edward
Reddick J. M.
Schofer Joseph L.
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