Granted Patent
Utility
US 4,857,572 · App. 07/157,116
Substituted phenols as stabilizers
Inventors:
Hans-Rudolf Meier, Gerrit Knobloch
Patented Case
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Granted: Aug 15, 1989
Filed: Feb 10, 1988
Inventors
Hans-Rudolf Meier
Gerrit Knobloch
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.