Granted Patent
Utility
US 5,799,395 · App. 08/692,814
Process for manufacturing an air gap-insulated exhaust pipe
Inventors:
Thomas Nording, Alfred Utter
Patented Case
View Patent ↗
Granted: Sep 1, 1998
Filed: Jul 30, 1996
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.