Granted Patent
Utility
US 5,298,541 · App. 07/776,387
Aryl phosphonites, a process for their production and their use for stabilizing plastics
Inventors:
Manfred Bohshar, Hans-Jerg Kleiner, Gerhard Pfahler
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Feb 20, 1992
Inventors
Manfred Bohshar
Hans-Jerg Kleiner
Gerhard Pfahler
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.