Granted Patent
Utility
US 4,899,983 · App. 07/298,443
Anti-wedging pressure seal ring apparatus
Inventors:
David B. Berrong, Thomas L. Schuchart
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Jan 18, 1989
Inventors
David B. Berrong
Thomas L. Schuchart
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.