Granted Patent
Utility
US 5,251,871 · App. 08/008,638
Fluid flow control valve and valve disk
Inventor:
Isao Suzuki
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jan 25, 1993
Inventor
Isao Suzuki
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.