Granted Patent
Utility
US 4,797,136 · App. 07/175,653
Low rank coal by wet oxidizing, drying and cooling
Inventors:
Mark A. Siddoway, Neal D. Stidham, William C. Machmer
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Mar 15, 1988
Inventors
Mark A. Siddoway
Neal D. Stidham
William C. Machmer
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.