Granted Patent
Utility
US 4,642,322 · App. 06/815,771
Stabilization of chlorine-containing thermoplastics with nitrogen-containing organic compounds
Inventors:
Wolfgang Wehner, Horst Muller, Rainer Schneider
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Jan 2, 1986
Inventors
Wolfgang Wehner
Horst Muller
Rainer Schneider
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.