Granted Patent
Utility
US 5,919,996 · App. 09/170,713
Olefin production
Inventors:
Jeffrey W. Freeman, John L. Buster, Ronald D. Knudsen
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Oct 13, 1998
Inventors
Jeffrey W. Freeman
John L. Buster
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.