Granted Patent
Utility
US 6,302,370 · App. 09/383,987
Valve seating control device with variable area orifice
Inventors:
John A. Schwoerer, Edward T. Leitkowski
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Aug 26, 1999
Inventors
John A. Schwoerer
Edward T. Leitkowski
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.