Granted Patent
Utility
US 5,996,393 · App. 09/027,837
Extrusion die for tungsten alloys
Inventors:
Dennis P. Buttleman, Phillip D. Wurzler, Kenneth Brown
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Feb 23, 1998
Inventors
Dennis P. Buttleman
Phillip D. Wurzler
Kenneth Brown
Assignee (at issue)
OSRAM SYLVANIA 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.