Granted Patent
Utility
US 4,603,834 · App. 06/591,022
Mounting of disk in a disk valve
Inventor:
Fred W. Hendrick
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Mar 19, 1984
Inventor
Fred W. Hendrick
Assignee (at issue)
SMITH INTERNATIONAL, INC.
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.