Granted Patent
Utility
US 4,905,656 · App. 07/237,812
Emission control valve with internal spring
Inventors:
Joseph T. Betterton, Alfred H. Glover, Thomas S. McKee, Chris S. Romanczuk
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Aug 29, 1988
Inventors
Joseph T. Betterton
Alfred H. Glover
Thomas S. McKee
Chris S. Romanczuk
Assignee (at issue)
Chrysler Motors 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.