Granted Patent
Utility
US 4,253,579 · App. 06/053,138
Modular boom construction
Inventor:
Thomas R. Williams
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Jun 28, 1979
Inventor
Thomas R. Williams
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.