Granted Patent
Utility
US 6,165,412 · App. 09/390,201
Method of making non-sag tungsten wire for electric lamps
Inventors:
Hans-Joachim Lunk, Michael Salmen, Henry J. Stevens
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Sep 7, 1999
Inventors
Hans-Joachim Lunk
Michael Salmen
Henry J. Stevens
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.