Granted Patent
Utility
US 4,598,652 · App. 06/772,524
Coal combustion to produce clean low-sulfur exhaust gas
Inventor:
Malcolm T. Hepworth
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Sep 4, 1985
Inventor
Malcolm T. Hepworth
Assignee (at issue)
AMAX INCORPORATED
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.