Granted Patent
Utility
US 4,582,511 · App. 06/694,740
Process for suppressing the dusting of coal
Inventors:
Mark A. Siddoway, Donald E. Hardesty, John King, William C. Machmer
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Jan 25, 1985
Inventors
Mark A. Siddoway
Donald E. Hardesty
John King
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.