Granted Patent
Utility
US 4,897,218 · App. 07/041,902
Methods for suppressing cement clinker dust emissions
Inventor:
Donald Carroll Roe
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Apr 24, 1987
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.