Granted Patent
Utility
US 4,385,147 · App. 06/300,365
Stabilization of chlorine-containing thermoplastics with m-aminophenol derivatives
Inventors:
Hermann O. Wirth, Jurgen Bussing, Hans-Helmut Friedrich
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Sep 8, 1981
Inventors
Hermann O. Wirth
Jurgen Bussing
Hans-Helmut Friedrich
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.