Granted Patent
Utility
US 5,135,032 · App. 07/744,771
Slurry gate valve
Inventor:
Glenn C. Parks, Jr.
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Aug 14, 1991
Inventor
Glenn C. Parks, Jr.
Assignee (at issue)
Foster Valve 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.