Granted Patent
Utility
US 4,300,637 · App. 06/120,696
Tool for remotely determining the position of a device in an underwater well assembly
Inventor:
William A. Valka
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Feb 11, 1980
Inventor
William A. Valka
Assignee (at issue)
Armco 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.