Granted Patent
Utility
US 6,048,447 · App. 09/026,448
Asphalt compositions containing solvent deasphalted bottoms and rerefined lube oil bottoms, and their preparation
Inventors:
Roger E. Hayner, Patricia K. Doolin, Howard F. Moore, Donald P. Malone
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: Feb 19, 1998
Inventors
Roger E. Hayner
Patricia K. Doolin
Howard F. Moore
Donald P. Malone
Assignee (at issue)
Marathon Ashland Petroleum LLC
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.