Granted Patent
Utility
US 6,444,328 · App. 09/382,588
FE-B-R based permanent magnet having corrosion-resistant film, and process for producing the same
Inventors:
Takeshi Nishiuchi, Fumiaki Kikui, Kohshi Yoshimura
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Aug 25, 1999
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.