Granted Patent
Utility
US 5,343,949 · App. 07/943,100
Isolation washpipe for earth well completions and method for use in gravel packing a well
Inventors:
Colby M. Ross, Dhirajlal C. Patel, Timothy F. LaBruyere
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Sep 10, 1992
Inventors
Colby M. Ross
Dhirajlal C. Patel
Timothy F. LaBruyere
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.