Granted Patent
Utility
US 6,420,673 · App. 09/789,115
Powdered metal emissive elements
Inventor:
Valerian Nemchinsky
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Feb 20, 2001
Inventor
Valerian Nemchinsky
Assignee (at issue)
THE ESAB GROUP 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.