Granted Patent
Utility
US 4,941,295 · App. 07/337,158
Abrasive elevating apparatus for blast machines and method of using
Inventor:
James H. Carpenter
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Apr 12, 1989
Inventor
James H. Carpenter
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.