Granted Patent
Utility
US 4,401,542 · App. 06/267,712
Metal finishing barrel
Inventors:
Frank P. Zamiska, Norman B. Tipton
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: May 28, 1981
Inventors
Frank P. Zamiska
Norman B. Tipton
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.