Granted Patent
Utility
US 4,239,305 · App. 06/006,553
Live roller circle for power shovels and the like
Inventor:
George B. Baron
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Jan 24, 1979
Inventor
George B. Baron
Assignee (at issue)
Dresser Industries, 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.