Granted Patent
Utility
US 4,858,044 · App. 07/115,268
Disc drive spindle motor with low cogging torque
Inventor:
Alan D. Crapo
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Oct 30, 1987
Inventor
Alan D. Crapo
Assignee (at issue)
Seagate Technology LLC
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.