Granted Patent
Utility
US 5,742,891 · App. 08/628,221
Tungsten-lanthana alloy wire for a vibration resistant lamp filament
Inventors:
Thomas J. Patrician, Harry D. Martin, III
Patented Case
View Patent ↗
Granted: Apr 21, 1998
Filed: Apr 4, 1996
Inventors
Thomas J. Patrician
Harry D. Martin, III
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.