Granted Patent
Utility
US 5,798,051 · App. 08/622,868
Sealing device for molten metal valve pin
Inventor:
Gary Hill
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Mar 29, 1996
Inventor
Gary Hill
Assignee (at issue)
Build A Mold Limited
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.