Granted Patent
Utility
US 4,477,055 · App. 06/509,483
Valve seat for ball valves
Inventor:
Charles C. Partridge
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Jun 30, 1983
Inventor
Charles C. Partridge
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.