Granted Patent
Utility
US 6,422,254 · App. 09/672,666
Hydraulic control cold start neutral valve
Inventor:
James D. Ryken
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Jan 8, 2001
Inventor
James D. Ryken
Assignee (at issue)
SAUER-DANFOSS INC.
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.