Granted Patent
Utility
US 5,352,245 · App. 07/984,188
Process for tinting contact lens
Inventors:
Kai C. Su, William M. Hung
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Nov 20, 1992
Inventors
Kai C. Su
William M. Hung
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.