N,N'-Bis-(2,3-dihydroxypr opyl)-2,4,6-triiodo-5-(2-keto-L-gulonamido)isophthalamide and radiological compositions containing same

Granted: Mar 17, 1981 Filed: Mar 23, 1979

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.