Granted Patent
Utility
US 6,832,655 · App. 10/256,736
Method for cleaning gravel packs
Inventors:
John Ravensbergen, John Misselbrook, Lance Portman
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Sep 27, 2002
Inventors
John Ravensbergen
John Misselbrook
Lance Portman
Assignee (at issue)
BJ SERVICES, LLC
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.