Granted Patent
Utility
US 6,718,921 · App. 10/195,614
Method and apparatus for cleaning an oil control valve for an internal combustion engine
Inventors:
Amanpal S. Grewal, Daniel L. McKay, Daniel G. Gauthier, James P. Waters, Jeffrey M. Pfeiffer
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Jul 15, 2002
Inventors
Amanpal S. Grewal
Daniel L. McKay
Daniel G. Gauthier
James P. Waters
Jeffrey M. Pfeiffer
Assignee (at issue)
Delphi Technologies
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.