Granted Patent
Utility
US 5,489,374 · App. 08/334,647
Process for isolating mesophase pitch
Inventors:
H. Ernest Romine, W. Mark Southard, Edward J. Nanni, Mark W. Carel
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Nov 7, 1994
Inventors
H. Ernest Romine
W. Mark Southard
Edward J. Nanni
Mark W. Carel
Assignee (at issue)
Conoco Inc.
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.