Granted Patent
Utility
US 4,574,840 · App. 06/687,350
Multiport axial valve with balanced rotor
Inventors:
Gary Schumann, Charles A. Dolejs, David L. Schick
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Dec 28, 1984
Inventors
Gary Schumann
Charles A. Dolejs
David L. Schick
Assignee (at issue)
UOP 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.