Granted Patent
Utility
US 5,332,045 · App. 08/001,020
Apparatus and method for placing and for backwashing well filtration devices in uncased well bores
Inventors:
Colby M. Ross, Henry L. Restarick
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Jan 6, 1993
Inventors
Colby M. Ross
Henry L. Restarick
Assignee (at issue)
Halliburton
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.