Granted Patent
Utility
US 5,330,157 · App. 08/098,145
Rotary disk valve
Inventors:
Charles D. Dern, David Losan Ho
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Jul 28, 1993
Inventors
Charles D. Dern
David Losan Ho
Assignee (at issue)
HULL PARTNERS, 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.