Granted Patent
Utility
US 4,378,104 · App. 06/221,847
Fluid-pressure-loaded seal for butterfly valves
Inventor:
Yoram Ben-Ur
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Dec 31, 1980
Inventor
Yoram Ben-Ur
Assignee (at issue)
Edison International Inc.
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.