Granted Patent
Utility
US 4,379,488 · App. 06/230,879
Latch for well tool
Inventor:
Eddie J. Hamm
Patented Case
View Patent ↗
Granted: Apr 12, 1983
Filed: Feb 2, 1981
Inventor
Eddie J. Hamm
Assignee (at issue)
Otis Engineering Corporation
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.