Granted Patent
Utility
US 4,469,172 · App. 06/462,581
Self-energizing locking mechanism
Inventor:
David A. Clark
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jan 31, 1983
Inventor
David A. Clark
Assignee (at issue)
Hughes Tool Company LLC
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.