Granted Patent
Utility
US 4,236,863 · App. 05/973,397
Center pin assembly for power shovels
Inventor:
George B. Baron
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Dec 22, 1978
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.