Granted Patent
Utility
US 5,387,291 · App. 08/032,101
Process for producing alloy powder material for R-Fe-B permanent magnets and alloy powder for adjusting the composition therefor
Inventors:
Yuji Kaneko, Koki Tokuhara
Patented Case
View Patent ↗
Granted: Feb 7, 1995
Filed: Mar 17, 1993
Inventors
Yuji Kaneko
Koki Tokuhara
Assignee (at issue)
Sumitomo Special Metals Co., Ltd.
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.