Granted Patent
Utility
US 5,798,623 · App. 08/598,584
Switch mode sine wave driver for polyphase brushless permanent magnet motor
Inventor:
Ashraf I. El-Sadi
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Feb 12, 1996
Inventor
Ashraf I. El-Sadi
Assignee (at issue)
Quantum Corporation
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.