Granted Patent
Utility
US 4,293,116 · App. 06/077,076
Metallic seat assembly for valves
Inventor:
John Hinrichs
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Sep 19, 1979
Inventor
John Hinrichs
Assignee (at issue)
ACF Industries Incorporated
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.