Granted Patent
Utility
US 4,423,930 · App. 06/246,238
Polymeric contact lens materials with high oxygen permeability
Inventor:
Don N. Gray
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Mar 23, 1981
Inventor
Don N. Gray
Assignee (at issue)
Owens-Illinois Inc.
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.