Granted Patent
Utility
US 6,581,377 · App. 10/024,929
Carburization of vehicle manifold flanges to prevent corrosion
Inventors:
Patrick M. Carlson, Dell G. Smith, Roger A. Braun, Thomas Ketelhut
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Dec 19, 2001
Inventors
Patrick M. Carlson
Dell G. Smith
Roger A. Braun
Thomas Ketelhut
Assignee (at issue)
Metaldyne Tubular Products, Inc.
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.