Granted Patent
Utility
US 4,387,481 · App. 06/234,982
Soot blower
Inventor:
Gerald F. Zalewski
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Feb 17, 1981
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.