Granted Patent
Utility
US 6,188,947 · App. 09/435,651
Closed loop speed control of ABS pump motor utilizing variable duty cycle and frequency
Inventor:
Wei Zhan
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Nov 8, 1999
Inventor
Wei Zhan
Assignee (at issue)
KELSEY-HAYES-COMPANY
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.