Bis2-1,2-benzisothiazol-3(2H)-ylidene 1,1-dioxide)-2-cyanoacetamide! charge-control agents for electrostatographic toners

Granted: Feb 10, 1998 Filed: Mar 14, 1997

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.