Granted Patent
Utility
US 5,203,072 · App. 07/791,096
Detachable crane- or boom-operated heat exchanger tube bundle extractor
Inventor:
Thomas B. Boisture
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Nov 12, 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.