Granted Patent
Utility
US 3,958,314 · App. 05/487,434
Seal for butterfly valves
Inventor:
Gregory A. Kurkjian, Jr.
Patented Case
View Patent ↗
Granted: May 25, 1976
Filed: Jul 11, 1974
Inventor
Gregory A. Kurkjian, Jr.
Assignee (at issue)
Henry Pratt Company
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.