Granted Patent
Utility
US 4,422,774 · App. 06/246,010
Metal finishing barrel apparatus
Inventor:
Frank Little
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Mar 20, 1981
Inventor
Frank Little
Assignee (at issue)
The Harshaw Chemical 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.