Granted Patent
Utility
US 4,953,722 · App. 07/269,222
Crane and lift enhancing beam attachment with moveable counterweight
Inventors:
Thomas K. Becker, Terry S. Casavant, P. Ralph Helm, Terry L. Petzold, Michael J. Wanek, Art G Zuehlke
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Nov 9, 1988
Inventors
Thomas K. Becker
Terry S. Casavant
P. Ralph Helm
Terry L. Petzold
Michael J. Wanek
Art G Zuehlke
Assignee (at issue)
The Manitowoc Company, 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.