Granted Patent
Utility
US 6,573,215 · App. 09/990,430
Material for bearing rolling element
Inventors:
Kazuo Hokkirigawa, Rikuro Obara, Motoharu Akiyama
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Nov 21, 2001
Inventors
Kazuo Hokkirigawa
Rikuro Obara
Motoharu Akiyama
Assignee (at issue)
Minebea 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.