Granted Patent
Utility
US 6,491,887 · App. 09/593,071
Supported sulfur compositions and the preparation and use thereof
Inventors:
Tin-Tack Peter Cheung, Donald H. Kubicek, David E. Legg
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jun 13, 2000
Inventors
Tin-Tack Peter Cheung
Donald H. Kubicek
David E. Legg
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.