Granted Patent
Utility
US 5,420,213 · App. 08/226,223
Polysiloxanes, methods of making same and high refractive index silicones made from same
Inventor:
Shih-Liang S. Yang
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: Apr 11, 1994
Inventor
Shih-Liang S. Yang
Assignee (at issue)
Allergan, 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.