Bis(3-cyano-3,5,5-trimethyl-cyclohexylidene)-azine, a method of its preparation and further processing to 3-(aminomethyl)-3,5,5-trimethylcyclohexyl amine

Granted: Nov 24, 1992 Filed: Oct 23, 1991

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.