Granted Patent
Utility
US 5,281,640 · App. 07/920,112
Diarylphosphinous acid aryl esters, a process for their preparation and their use for stabilizing plastics
Inventors:
Dieter Regnat, Manfred Bohshar, Hans-Jerg Kleiner, Gerhard Pfahler
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Jul 24, 1992
Inventors
Dieter Regnat
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.