Granted Patent
Utility
US 5,907,134 · App. 08/368,417
Air gap-insulated exhaust pipe and process for manufacturing same
Inventors:
Thomas Nording, Alfred Utter
Patented Case
View Patent ↗
Granted: May 25, 1999
Filed: Jan 4, 1995
Inventors
Thomas Nording
Alfred Utter
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.