Granted Patent
Utility
US 4,694,852 · App. 06/868,568
Flow regulating valve for controlling the flow of corrosive fluids
Inventor:
Robert W. Grant
Patented Case
View Patent ↗
Granted: Sep 22, 1987
Filed: May 30, 1986
Inventor
Robert W. Grant
Assignee (at issue)
FSI HOLDINGS, LLC
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.