Granted Patent
Utility
US 4,480,757 · App. 06/343,717
Collapsible frame support for pivotal boom on a portable crane
Inventor:
Maynard A. Oustad
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jan 28, 1982
Inventor
Maynard A. Oustad
Assignee (at issue)
AMCA International 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.