Granted Patent
Utility
US 4,669,973 · App. 06/883,608
Combustion chamber for heating devices
Inventors:
Herbert Langen, Erich Kenner
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Jul 9, 1986
Inventors
Herbert Langen
Erich Kenner
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.