Granted Patent
Utility
US 5,717,049 · App. 08/622,527
High refractive index hydrogels prepared from polymers and copolymers of N-benzyl-N-methylacrylamide
Inventors:
Xiugao Liao, Yading Wang, Stephen Q. Zhou
Patented Case
View Patent ↗
Granted: Feb 10, 1998
Filed: Mar 25, 1996
Inventors
Xiugao Liao
Yading Wang
Stephen Q. Zhou
Assignee (at issue)
Pharmacia Iovision, 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.