Granted Patent
Utility
US 6,410,489 · App. 09/474,149
Foam-fluid for fracturing subterranean formations
Inventors:
Kewei Zhang, Ron Pierce, Nicole Deanne Litt, D. V. Satyanarayana Gupta
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Dec 29, 1999
Inventors
Kewei Zhang
Ron Pierce
Nicole Deanne Litt
D. V. Satyanarayana Gupta
Assignee (at issue)
BJ SERVICES COMPANY CANADA
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.