Granted Patent
Utility
US 4,697,391 · App. 06/811,749
Vane retention apparatus for abrasive blasting machine
Inventors:
James H. Carpenter, Kenneth R. Peters
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Dec 20, 1985
Inventors
James H. Carpenter
Kenneth R. Peters
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.