Granted Patent
Utility
US 4,304,337 · App. 06/154,510
Marine crane lifting control
Inventor:
Robert E. Dummer
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: May 29, 1980
Inventor
Robert E. Dummer
Assignee (at issue)
Bucyrus Erie Company
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.