Granted Patent
Utility
US 3,985,334 · App. 05/590,048
Ball valve
Inventor:
Frank F. Domyan
Patented Case
View Patent ↗
Granted: Oct 12, 1976
Filed: Jun 25, 1975
Inventor
Frank F. Domyan
Assignee (at issue)
International Telephone and Telegraph Corporation
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.