Granted Patent
Utility
US 5,980,819 · App. 09/038,963
Sintered oil-impregnated bearing, manufacturing method thereof, and motor comprising same
Inventors:
Hisaya Nakagawa, Toru Nakanishi, Michiaki Takizawa, Takehiko Yazawa
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Mar 12, 1998
Inventors
Hisaya Nakagawa
Toru Nakanishi
Michiaki Takizawa
Takehiko Yazawa
Assignee (at issue)
Kabushiki Kaisha Sankyo Seiki Seisakusho
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.