Granted Patent
Utility
US 4,431,028 · App. 06/251,394
Multiple orifice valve with low volume flow control
Inventor:
Fred W. Hendrick
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Apr 6, 1981
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.