Granted Patent
Utility
US 4,240,608 · App. 06/090,761
Controlled float seat arrangement for expanding gate valves
Inventor:
Charles C. Partridge
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Nov 2, 1979
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.