Aromatic diamines and their use as polycondensation components for the manufacture of polyamide, polyamide-imide and polyimide polymers

Granted: Dec 16, 1980 Filed: Jul 17, 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.