Granted Patent
Utility
US 4,559,186 · App. 06/633,070
Production of borate crosslinked polyvinyl alcohol contact lenses
Inventor:
Ping I. Lee
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Jul 23, 1984
Inventor
Ping I. Lee
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.