Granted Patent
Utility
US 5,146,945 · App. 07/446,957
Seal ring retainer and guide ring for valve plug
Inventors:
Joachim A. La Rosa, Joseph W. Ross, Frank Heymann
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Dec 6, 1989
Inventors
Joachim A. La Rosa
Joseph W. Ross
Frank Heymann
Assignee (at issue)
Westinghouse Electric Company LLC
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.