Granted Patent
Utility
US 6,376,089 · App. 09/649,593
Process for producing rare earth metal-based permanent magnet having corrosion-resistant film
Inventors:
Takeshi Nishiuchi, Atsushi Kikugawa, Fumiaki Kikui
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: Aug 29, 2000
Inventors
Takeshi Nishiuchi
Atsushi Kikugawa
Fumiaki Kikui
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.