Granted Patent
Utility
US 4,474,356 · App. 06/376,180
Control valve with integral streamlined seating means
Inventor:
Hans D. Baumann
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: May 7, 1982
Inventor
Hans D. Baumann
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.