Granted Patent
Utility
US 6,494,944 · App. 09/517,478
Amine oxides as asphalt emulsifiers
Inventors:
Julia Mary Wates, Bengt-Arne Thorstensson, Alan Duncan James
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Mar 2, 2000
Inventors
Julia Mary Wates
Bengt-Arne Thorstensson
Alan Duncan James
Assignee (at issue)
AKZO NOBEL N.V.
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.