Granted Patent
Utility
US 6,397,889 · App. 09/856,235
Method for mounting a rotary valve for power assisted steering systems, especially for motor vehicles
Inventor:
Wolfgang Rieger
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: May 18, 2001
Inventor
Wolfgang Rieger
Assignee (at issue)
ZF Lenksysteme GmbH
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.