N-2-chlorobenzyl-2-oxo and N-2-chlorobenzyl-2,2-dioxo-1,2,3-oxathiazolidine derivatives, their preparation and synthesis of thieno[3,2-c]pyridine derivatives therefrom

Granted: Aug 30, 1994 Filed: Jan 31, 1991

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.