Granted Patent
Utility
US 6,406,789 · App. 09/486,144
Composite proppant, composite filtration media and methods for making and using same
Inventors:
Robert Ray McDaniel, Johannes A. Geraedts
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: May 22, 2000
Inventors
Robert Ray McDaniel
Johannes A. Geraedts
Assignee (at issue)
Borden Chemical, Inc.
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.