Granted Patent
Utility
US 4,138,325 · App. 05/863,403
Process for conversion of gas oil to ethylene and needle coke
Inventors:
Harold Beuther, Joel D. McKinney, Harold E. Swift
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Dec 22, 1977
Inventors
Harold Beuther
Joel D. McKinney
Harold E. Swift
Assignee (at issue)
Gulf Research & Development 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.