Granted Patent
Utility
US 4,410,163 · App. 06/344,502
Valve seat
Inventors:
William B. Scobie, Edward G. Holtgraver
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Feb 1, 1982
Inventors
William B. Scobie
Edward G. Holtgraver
Assignee (at issue)
Keystone International
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.