Granted Patent
Utility
US 4,969,421 · App. 07/428,399
Cooling device for an internal combustion engine
Inventors:
Bernhard Haner, Siegfried Sieben
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Oct 30, 1989
Inventors
Bernhard Haner
Siegfried Sieben
Assignee (at issue)
General Motors LLC
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.