Granted Patent
Utility
US 5,331,034 · App. 07/791,448
Process for reducing the discoloration of a plastic molding composition at the processing temperature
Inventors:
Gerhard Pfahler, Georg Schmailzl
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Nov 13, 1991
Inventors
Gerhard Pfahler
Georg Schmailzl
Assignee (at issue)
Hoechst GmbH
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.