IP Library › Granted Patent US 4,954,132
Granted Patent Utility
US 4,954,132 · App. 07/323,355

Tinted contact lens and method of tinting with reactive dye and quaternary ammonium salt

Inventors: William M. Hung, Kai C. Su
Patented Case View Patent ↗
Granted: Sep 4, 1990 Filed: Mar 14, 1989
Inventors
William M. Hung
Kai C. Su
Assignee (at issue)
Ciba-Geigy

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Quick Facts
Patent No.
US 4,954,132
App. No.
07/323,355
Filed
1989-03-14
Granted
1990-09-04
Kind
A