Granted Patent
Utility
US 6,660,894 · App. 09/718,044
Process for upgrading an oligomerization product
Inventors:
An-hsiang Wu, Charles A. Drake, Ronald D. Knudsen
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Nov 21, 2000
Inventors
An-hsiang Wu
Charles A. Drake
Ronald D. Knudsen
Assignee (at issue)
Phillips Petroleum Company
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.