Granted Patent
Utility
US 6,354,254 · App. 09/549,028
Exhaust and intake rocker arm assemblies for modifying valve lift and timing during positive power
Inventor:
James Usko
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Apr 13, 2000
Inventor
James Usko
Assignee (at issue)
Diesel Engine Retarders, 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.