Granted Patent
Utility
US 5,203,535 · App. 07/715,069
Cam actuated valve assembly with hydraulic spring
Inventors:
William E. Richeson, Frederick L. Erickson
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Jun 13, 1991
Inventors
William E. Richeson
Frederick L. Erickson
Assignee (at issue)
North American Philips Corporation
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.