Granted Patent
Utility
US 4,284,141 · App. 05/368,840
Subsurface well apparatus and method
Inventor:
James D. Mott
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jun 11, 1973
Inventor
James D. Mott
Assignee (at issue)
Hydril Company
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.