Granted Patent
Utility
US 4,448,397 · App. 06/440,850
Pneumatic powered hoist
Inventor:
Robert H. Broyden
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Nov 12, 1982
Inventor
Robert H. Broyden
Assignee (at issue)
Columbus McKinnon 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.