Granted Patent
Utility
US 4,871,403 · App. 07/223,807
Method for producing electrical steel core laminations
Inventor:
Gregory Ludkovsky
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Jul 25, 1988
Inventor
Gregory Ludkovsky
Assignee (at issue)
Inland Steel 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.