Granted Patent
Utility
US 4,757,646 · App. 07/026,199
Boom for wire coil blasting apparatus
Inventor:
Ronald Goetz
Patented Case
View Patent ↗
Granted: Jul 19, 1988
Filed: Mar 16, 1987
Inventor
Ronald Goetz
Assignee (at issue)
Pangborn Corporation
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.