Granted Patent
Utility
US 4,688,690 · App. 06/837,176
Method and apparatus for extending fly section of crane boom
Inventors:
Narahari Gattu, Bryan K. Bailey
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Mar 7, 1986
Inventors
Narahari Gattu
Bryan K. Bailey
Assignee (at issue)
Harnischfeger Corporation
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.