Granted Patent
Utility
US 4,309,228 · App. 06/133,571
Electro magnetic steels
Inventors:
James H. Page, Alan Coombs
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Mar 24, 1980
Inventors
James H. Page
Alan Coombs
Assignee (at issue)
British Steel Corporation
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.