Granted Patent
Utility
US 4,891,046 · App. 06/589,747
Tinted contact lens and method for preparation with dichlorotriazine reactive dye
Inventors:
Joseph Wittmann, John M. Evans
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Mar 15, 1984
Inventors
Joseph Wittmann
John M. Evans
Assignee (at issue)
Coopervision, 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.