Granted Patent
Utility
US 5,494,155 · App. 08/269,163
Incorporation of absorbents during extraction and/or hydration of hydrogel materials used as ophthalmic devices
Inventors:
John M. Evans, William E. Meyers, Joseph I. Weinschenk, III
Patented Case
View Patent ↗
Granted: Feb 27, 1996
Filed: Jun 29, 1994
Inventors
John M. Evans
William E. Meyers
Joseph I. Weinschenk, III
Assignee (at issue)
Pilkington Barnes Hind, 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.