Granted Patent
Utility
US 4,579,668 · App. 06/499,117
Well servicing agents and processes
Inventor:
Joseph U. Messenger
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: May 27, 1983
Inventor
Joseph U. Messenger
Assignee (at issue)
Western Company of North America
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.