Granted Patent
Utility
US 5,138,987 · App. 07/811,674
Process for heating the intake air internal combustion engines by means of a flame starting system
Inventors:
Friedrich Schmid, Friedrich Hase, Peter Joppig, Roland Klak
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Dec 23, 1991
Inventors
Friedrich Schmid
Friedrich Hase
Peter Joppig
Roland Klak
Assignee (at issue)
MERCEDES-BENZ GROUP AG
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.