Granted Patent
Utility
US 4,450,262 · App. 06/407,270
Hydrophilic copolymer compositions useful as contact lenses
Inventors:
Nancy J. Drake, Michael D. Hilston, Mary A. O'Malley
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Aug 11, 1982
Inventors
Nancy J. Drake
Michael D. Hilston
Mary A. O'Malley
Assignee (at issue)
Diamond Shamrock Chemicals Company
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.