Granted Patent
Utility
US 6,770,177 · App. 10/039,403
Cathodic protection system for air compressor tanks
Inventors:
Charles Keller, William Lewis
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Nov 7, 2001
Inventors
Charles Keller
William Lewis
Assignee (at issue)
Ingersoll-Rand 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.