Granted Patent
Utility
US 4,457,368 · App. 06/478,741
Shearable no go insert for a well lock
Inventors:
Jeffrey L. Knierimen, Mark S. Fuller
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Mar 25, 1983
Inventors
Jeffrey L. Knierimen
Mark S. Fuller
Assignee (at issue)
Camco 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.