Granted Patent
Utility
US 5,251,565 · App. 07/855,822
Process and apparatus for removal of carbonaceous materials from particles containing such materials
Inventor:
Michael C. Phillips
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Mar 23, 1992
Inventor
Michael C. Phillips
Assignee (at issue)
SHELL OIL COMPANY
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.