Granted Patent
Utility
US 5,301,708 · App. 08/015,603
Rotary plug valve actuator and associated rotary plug valve and associated method
Inventor:
George Schmidt
Patented Case
View Patent ↗
Granted: Apr 12, 1994
Filed: Feb 9, 1993
Inventor
George Schmidt
Assignee (at issue)
Aluminum Company of America
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.