Granted Patent
Utility
US 4,358,021 · App. 06/128,139
Separated ring segment dual pivot lift crane
Inventors:
Percy R. Helm, James G. Morrow, Sr.
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Mar 7, 1980
Inventors
Percy R. Helm
James G. Morrow, Sr.
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.