Granted Patent
Utility
US 4,554,972 · App. 06/605,215
Well tool locking device
Inventor:
David T. Merritt
Patented Case
View Patent ↗
Granted: Nov 26, 1985
Filed: Apr 30, 1984
Inventor
David T. Merritt
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.