Granted Patent
Utility
US 4,468,229 · App. 06/382,973
Tinted contact lenses and a method for their preparation with reactive dyes
Inventor:
Kai C. Su
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Jun 1, 1982
Inventor
Kai C. Su
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.