Granted Patent
Utility
US 4,413,679 · App. 06/375,842
Wellbore cathodic protection
Inventor:
Thomas K. Perkins
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: May 7, 1982
Inventor
Thomas K. Perkins
Assignee (at issue)
Atlantic Richfield 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.