Granted Patent
Utility
US 4,272,285 · App. 06/168,889
Process for producing magnetic metal powders
Inventor:
Rioichi Horimoto
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jul 11, 1980
Inventor
Rioichi Horimoto
Assignee (at issue)
TDK Electronics AG
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.