Granted Patent
Utility
US 5,164,462 · App. 07/691,149
Ultraviolet light absorbing compounds and silicone compositions
Inventor:
Shih-Liang S. Yang
Patented Case
View Patent ↗
Granted: Nov 17, 1992
Filed: Apr 25, 1991
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.