Process for the preparation of trifluoromethyl-substituted biphenylcarboxylic acids and novel trichloromethyl-and trifluoromethyl-substituted biphenylcarbonitriles

Granted: Oct 15, 2002 Filed: Jan 8, 2002

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.