Granted Patent
Utility
US 4,830,637 · App. 07/173,850
Preagglomeration of fine coal before thermal dryer in a preparation plant
Inventor:
George E. Wasson
Patented Case
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Granted: May 16, 1989
Filed: Mar 28, 1988
Inventor
George E. Wasson
Assignee (at issue)
Consolidation Coal 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.