Mercaptoacetylamido pyridazo [1,2]pyridazine, pyrazolo[1,2]pyridazine pyrazolo[1,2]pyridazine, pyridazol[1,2-a][1,2]diazepine and pyrazolol[1,2-a][1,2]diazepine

Granted: Nov 22, 1994 Filed: Nov 3, 1993

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.