Granted Patent
Utility
US 4,776,566 · App. 07/072,114
Raised hardface overlay valve seat
Inventor:
Harry W. Girdley
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Jul 10, 1987
Inventor
Harry W. Girdley
Assignee (at issue)
Henry Vogt Machine Co.
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.