Granted Patent
Utility
US 6,431,459 · App. 09/982,037
Liquid fuel-operated water heater or air heater of a motor vehicle
Inventor:
Michael Humburg
Patented Case
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Granted: Aug 13, 2002
Filed: Oct 18, 2001
Inventor
Michael Humburg
Assignee (at issue)
J. Eberspaecher GmbH & Co. KG
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.