Granted Patent
Utility
US 6,499,562 · App. 09/607,115
Muffler with variable sound-absorbing characteristics
Inventors:
Gerhard Elfinger, Wolfgang Hahnl, Friedrich Wellner, Andreas Mayr, Klaus Spindler, Thomas Koehler, Hans Bussmann
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Jun 29, 2000
Inventors
Gerhard Elfinger
Wolfgang Hahnl
Friedrich Wellner
Andreas Mayr
Klaus Spindler
Thomas Koehler
Hans Bussmann
Assignee (at issue)
Zeuna-Starker 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.