Granted Patent
Utility
US 4,286,417 · App. 06/064,753
Blasting machine with position sensing and adjustment
Inventor:
John J. Shelton
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Aug 8, 1979
Inventor
John J. Shelton
Assignee (at issue)
Robert E. Nelson
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.