Granted Patent
Utility
US 5,256,169 · App. 07/729,522
Methods and compositions for dewatering and suppressing dust during processing of fine coal
Inventor:
Donald Carroll Roe
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Jul 12, 1991
Inventor
Donald Carroll Roe
Assignee (at issue)
Betz Laboratories, Inc.
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.