Granted Patent
Utility
US 4,898,850 · App. 07/278,857
Pyridone dyestuff for thermal transfer recording and printing sheets and methods employing same
Inventors:
Akitosi Igata, Tamio Mikoda
Patented Case
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Granted: Feb 6, 1990
Filed: Dec 2, 1988
Inventors
Akitosi Igata
Tamio Mikoda
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.