Granted Patent
Utility
US 4,209,028 · App. 06/043,048
Lance construction for boiler cleaning apparatus
Inventor:
Jack D. Shenker
Patented Case
View Patent ↗
Granted: Jun 24, 1980
Filed: May 29, 1979
Inventor
Jack D. Shenker
Assignee (at issue)
The Babcock & Wilcox 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.