Granted Patent
Utility
US 4,604,931 · App. 06/766,601
Quick change rotary punch
Inventors:
Donald G. Bastian, Gregory L. Slepicka
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Aug 16, 1985
Inventors
Donald G. Bastian
Gregory L. Slepicka
Assignee (at issue)
Harris Graphics
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.