Granted Patent
Utility
US 4,344,814 · App. 06/304,590
Apparatus for heat sealing round containers
Inventor:
Edwin C. McLaren
Patented Case
View Patent ↗
Granted: Aug 17, 1982
Filed: Sep 22, 1981
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.