Granted Patent
Utility
US 5,340,855 · App. 08/063,999
N-methylated bis-4-piperidylphosphite
Inventors:
Hans-Rudolf Meier, Peter Hofmann
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: May 17, 1993
Inventors
Hans-Rudolf Meier
Peter Hofmann
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.