Granted Patent
Utility
US 4,598,122 · App. 06/693,484
Polyoxirane crosslinked polyvinyl alcohol hydrogel contact lens
Inventor:
Merrill Goldenberg
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Jan 22, 1985
Inventor
Merrill Goldenberg
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.