Granted Patent
Utility
US 5,489,503 · App. 08/350,300
UV absorbers
Inventor:
Vien Van Toan
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Dec 6, 1994
Inventor
Vien Van Toan
Assignee (at issue)
Ciba-Geigy
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.