Granted Patent
Utility
US 4,934,231 · App. 07/335,993
Rotary die-cutting apparatus
Inventors:
W. Richard Chesnut, Daniel Calligaro, Vincent Trapasso
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Apr 10, 1989
Inventors
W. Richard Chesnut
Daniel Calligaro
Vincent Trapasso
Assignee (at issue)
W. R. Chesnut Engineering, Inc.
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.