Granted Patent
Utility
US 5,048,752 · App. 07/242,376
Method and apparatus for heat carrier circulation for a vehicle heating system having a heater independent of the engine
Inventors:
Hans Hintennach, Dietrich Schmalenbach
Patented Case
View Patent ↗
Granted: Sep 17, 1991
Filed: Sep 9, 1988
Inventors
Hans Hintennach
Dietrich Schmalenbach
Assignee (at issue)
J. Eberspacher
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.