5 (and/or 6) substituted 2-(2-imidazolin-2-yl)nicotinic acids, esters and salts, useful as herbicidal agents and novel intermediates for the preparation of said nicotinic acids, esters and salts

Granted: Aug 2, 1994 Filed: Mar 23, 1992

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.