Granted Patent
Utility
US 5,018,544 · App. 07/489,001
Apparatus for cleaning heat exchanger tube bundles
Inventors:
Thomas B. Boisture, Larry D. McGrew, James D. Jeffrey, Robert G. Wetzel, Gene P. Livingston, Robert Allen Baten
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Mar 6, 1990
Inventors
Thomas B. Boisture
Larry D. McGrew
James D. Jeffrey
Robert G. Wetzel
Gene P. Livingston
Robert Allen Baten
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.