Granted Patent
Utility
US 5,403,098 · App. 08/121,523
Hydrodynamic bearing device
Inventors:
Hiroyoshi Yasui, Masayoshi Onishi
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Sep 16, 1993
Inventors
Hiroyoshi Yasui
Masayoshi Onishi
Assignee (at issue)
Koyo Seiko 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.