4-alkyl-3-chlorobenzenesulfinic acids, 4-alkyl-3-chlorobenzenesulfonylcarboxylic acids, 4-alkyl-3-chloroalkylsulfonylbenzenes and preparation thereof

Granted: Mar 12, 1996 Filed: Mar 31, 1994

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.