Granted Patent
Utility
US 5,264,650 · App. 07/991,919
Sulfolane purification by hydrocarbon extraction
Inventors:
Michael Alan Better, Jonathan E. Child, Kenneth J. Del Rossi, Edward H. Edelson, Anagha A. Gupte, Rafi Jalkian, Tomas R. Melli, Sergei Yurchak
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Dec 17, 1992
Inventors
Michael Alan Better
Jonathan E. Child
Kenneth J. Del Rossi
Edward H. Edelson
Anagha A. Gupte
Rafi Jalkian
Tomas R. Melli
Sergei Yurchak
Assignee (at issue)
Mobil Oil Corporation
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.