Granted Patent
Utility
US 4,729,486 · App. 06/849,165
Lift enhancing beam attachment with movable counterweights
Inventors:
Terry L. Petzold, David J. Pech
Patented Case
View Patent ↗
Granted: Mar 8, 1988
Filed: Apr 7, 1986
Inventors
Terry L. Petzold
David J. Pech
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.