Granted Patent
Utility
US 5,247,779 · App. 07/842,201
Self voiding jaw for packaging machine
Inventors:
Ralph C. Wirsig, James William Sadler, John R. Thompson
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Mar 19, 1992
Inventors
Ralph C. Wirsig
James William Sadler
John R. Thompson
Assignee (at issue)
DuPont Canada 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.