Granted Patent
Utility
US 6,417,136 · App. 09/398,664
Hydrocarbon hydrogenation catalyst and process
Inventors:
Tin-Tack Peter Cheung, Darin B. Tiedtke, Marvin M. Johnson, Gary A. Delzer
Patented Case
View Patent ↗
Granted: Jul 9, 2002
Filed: Sep 17, 1999
Inventors
Tin-Tack Peter Cheung
Darin B. Tiedtke
Marvin M. Johnson
Gary A. Delzer
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.