5-(2-hydroxy-1-arylethylidene)- and 5-(2-oxo-1-arylethylidene)-2,4-thiazolidinediones and derivatives thereof

Granted: Aug 17, 1993 Filed: Jun 30, 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.