Granted Patent
Utility
US 5,160,548 · App. 07/756,616
Method for cleaning tube bundles using a slurry
Inventor:
Thomas B. Boisture
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Sep 9, 1991
Inventor
Thomas B. Boisture
Assignee (at issue)
Ohmstede Mechanical Services, 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.