Granted Patent
Utility
US 4,853,973 · App. 07/169,887
Welding helmet
Inventor:
E. L. Boochard
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Mar 18, 1988
Inventor
E. L. Boochard
Assignee (at issue)
Jackson Products, 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.