Granted Patent
Utility
US 4,524,981 · App. 06/554,188
Annular seal with V-cut
Inventor:
Daniel Hertz
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Nov 22, 1983
Inventor
Daniel Hertz
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.