Granted Patent
Utility
US 4,828,452 · App. 07/098,103
Single engine excavator capable of railroad use
Inventor:
Jack A. Bolitho
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Sep 17, 1987
Inventor
Jack A. Bolitho
Assignee (at issue)
The Gradall 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.