Granted Patent
Utility
US 4,423,546 · App. 06/299,391
Punch press with automatic tool changer
Inventors:
William B. Scott, Daniel C. Dickinson, Joel C. E. Arnesson
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Sep 4, 1981
Inventors
William B. Scott
Daniel C. Dickinson
Joel C. E. Arnesson
Assignee (at issue)
W.A. Whitney Co.
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.