Granted Patent
Utility
US 5,234,193 · App. 07/831,030
Rotary plug valve with seat seal
Inventors:
Leonard Neal, John Thomas
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Feb 3, 1992
Inventors
Leonard Neal
John Thomas
Assignee (at issue)
Parker-Hannifin 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.