Granted Patent
Utility
US 6,005,311 · App. 09/060,472
Spindle motor and turn table assembly having structure for canceling unbalanced centrifugal force
Inventor:
Shunji Matsushima
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Apr 15, 1998
Inventor
Shunji Matsushima
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.