Granted Patent
Utility
US 5,579,931 · App. 08/210,988
Liftcrane with synchronous rope operation
Inventors:
Arthur G. Zuehlke, David J. Pech
Patented Case
View Patent ↗
Granted: Dec 3, 1996
Filed: Mar 18, 1994
Inventors
Arthur G. Zuehlke
David J. Pech
Assignee (at issue)
Manitowoc Engineering Company
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.