Granted Patent
Utility
US 6,174,491 · App. 09/156,992
Lower pre-heat block for use in metal scarfing apparatus
Inventor:
Stephen August Engel
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Sep 18, 1998
Inventor
Stephen August Engel
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.