Granted Patent
Utility
US 6,213,318 · App. 09/259,223
Rotatable connection system for crane boom sections
Inventor:
Robert J. Walker
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Mar 1, 1999
Inventor
Robert J. Walker
Assignee (at issue)
Manitowoc Crane Companies, LLC
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.