Granted Patent
Utility
US 4,813,384 · App. 07/182,947
Soot blower lance with ceramic coating
Inventor:
Gerald F. Zalewski
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Apr 18, 1988
Inventor
Gerald F. Zalewski
Assignee (at issue)
White Consolidated Industries, 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.