Recording sheets containing pyrrole, pyrrolidine, pyridine, piperidine, homopiperidine, quinoline, isoquinoline, quinuclidine, indole, and indazole compounds

Granted: Nov 19, 2002 Filed: Feb 15, 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.