Granted Patent
Utility
US 4,672,920 · App. 06/819,721
Pressure compensated temperature switch unit for protection of an internal combustion engine
Inventor:
Wayne R. Duprez
Patented Case
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Granted: Jun 16, 1987
Filed: Jan 17, 1986
Inventor
Wayne R. Duprez
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.