Granted Patent
Utility
US 5,214,224 · App. 07/910,230
Dispersing asphaltenes in hydrocarbon refinery streams with .alpha.-olefin/maleic anhydride copolymer
Inventors:
David G. Comer, W. Kirk Stephenson
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Jul 9, 1992
Inventors
David G. Comer
W. Kirk Stephenson
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.