Granted Patent
Utility
US 4,731,393 · App. 06/873,853
Process for chemically bonding stabilizers to polymers
Inventors:
Friedrich Karrer, Peter Hofmann
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Jun 11, 1986
Inventors
Friedrich Karrer
Peter Hofmann
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.