Granted Patent
Utility
US 4,305,771 · App. 06/108,034
Method for heat sealing round containers
Inventor:
Edwin C. McLaren
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Dec 28, 1979
Inventor
Edwin C. McLaren
Assignee (at issue)
Champion International Corporation Limited
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.