Granted Patent
Utility
US 5,355,656 · App. 08/045,294
Heat sealing element for packaging machines which make lap-sealed pouches
Inventor:
Arnold E. Perrett
Patented Case
View Patent ↗
Granted: Oct 18, 1994
Filed: Apr 13, 1993
Inventor
Arnold E. Perrett
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.