Granted Patent
Utility
US 6,828,281 · App. 09/595,996
Surfactant blends for aqueous solutions useful for improving oil recovery
Inventors:
Wangqi Hou, Dave Feuerbacher
Patented Case
View Patent ↗
Granted: Dec 7, 2004
Filed: Jun 16, 2000
Inventors
Wangqi Hou
Dave Feuerbacher
Assignee (at issue)
Akzo Nobel Surface Chemistry 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.