Granted Patent
Utility
US 6,399,147 · App. 09/851,944
Process for producing Fe-B-R based permanent magnet having corrosion-resistant film
Inventors:
Takeshi Nishiuchi, Fumiaki Kikui, Kohshi Yoshimura
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: May 10, 2001
Inventors
Takeshi Nishiuchi
Fumiaki Kikui
Kohshi Yoshimura
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.