Granted Patent
Utility
US 6,247,552 · App. 09/038,877
Air gap-insulated exhaust manifold
Inventors:
Oliver Kovar, Thomas Nording
Patented Case
View Patent ↗
Granted: Jun 19, 2001
Filed: Mar 11, 1998
Inventors
Oliver Kovar
Thomas Nording
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.