Granted Patent
Utility
US 6,772,838 · App. 10/113,844
Lightweight particulate materials and uses therefor
Inventors:
Jeffrey C. Dawson, Allan R. Rickards
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Apr 1, 2002
Inventors
Jeffrey C. Dawson
Allan R. Rickards
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.