Granted Patent
Utility
US 4,686,952 · App. 06/944,312
Controlled PCV valve
Inventors:
Thornton W. Zeigler, Jr., Chris S. Romanczuk, Joseph T. Betterton, Alfred H. Glover
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Dec 22, 1986
Inventors
Thornton W. Zeigler, Jr.
Chris S. Romanczuk
Joseph T. Betterton
Alfred H. Glover
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.