Granted Patent
Utility
US 4,484,625 · App. 06/370,056
Well casing perforated zone washing apparatus
Inventor:
John Phillip Barbee, Jr.
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Apr 20, 1982
Inventor
John Phillip Barbee, Jr.
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.