Granted Patent
Utility
US 6,681,889 · App. 10/016,235
Exhaust muffler for a fuel-operated heating device
Inventors:
Andreas Collmer, Thomas Rose
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Dec 6, 2001
Inventors
Andreas Collmer
Thomas Rose
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.