Granted Patent
Utility
US 4,929,652 · App. 07/186,835
Polyolefins stabilized against damage caused by light
Inventor:
Francois Gugumus
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Apr 27, 1988
Inventor
Francois Gugumus
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.