Granted Patent
Utility
US 4,414,035 · App. 06/040,628
Method for the removal of asphaltenic deposits
Inventors:
Michael Newberry, Kenneth M. Barker
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: May 21, 1979
Inventors
Michael Newberry
Kenneth M. Barker
Assignee (at issue)
Petrolite 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.