Granted Patent
Utility
US 4,987,288 · App. 07/404,692
Gas metal arc welding wire
Inventor:
Donald W. Yonker, Jr.
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Sep 8, 1989
Inventor
Donald W. Yonker, Jr.
Assignee (at issue)
National Standard Company
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.