Granted Patent
Utility
US 5,239,076 · App. 07/928,246
N-methylated bis-4-piperidylphosphite
Inventors:
Hans-Rudolf Meier, Peter Hofmann
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Aug 10, 1992
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.