Recording sheets containing oxazole, isooxazole, oxazolidinone, oxazoline salt, morpholine, thiazole, thiazolidine, thiadiazole, and phenothiazine compounds

Granted: Jan 30, 2001 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.