Granted Patent
Utility
US 4,672,809 · App. 06/859,438
Catalytic converter for a diesel engine
Inventors:
Richard C. Cornelison, William B. Retallick
Patented Case
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Granted: Jun 16, 1987
Filed: May 5, 1986
Inventors
Richard C. Cornelison
William B. Retallick
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.