Granted Patent
Utility
US 4,789,251 · App. 07/158,771
Cooling networks for PCD bearing surfaces
Inventors:
James McPherson, David R. Hall
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Feb 22, 1988
Inventors
James McPherson
David R. Hall
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.