Granted Patent
Utility
US 4,574,894 · App. 06/754,474
Ball actuable circulating dump valve
Inventor:
Reese Jadwin
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Jul 12, 1985
Inventor
Reese Jadwin
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.