Granted Patent
Utility
US 6,819,211 · App. 10/034,121
Process for surface-treatment of hollow work having hole communicating with outside, and ring-shaped bonded magnet produced by the process
Inventors:
Kohshi Yoshimura, Takeshi Nishiuchi, Fumiaki Kikui
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Jan 3, 2002
Inventors
Kohshi Yoshimura
Takeshi Nishiuchi
Fumiaki Kikui
Assignee (at issue)
Neomax 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.