Granted Patent
Utility
US 4,971,756 · App. 07/350,941
Method for producing dies for use in compacting permanent magnet alloy powders
Inventor:
John J. DuPlessis
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: May 12, 1989
Inventor
John J. DuPlessis
Assignee (at issue)
Crucible Materials 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.