A continuous electrically conductive ring is applied to the top of a lid which is used for covering a container opening. The lid is then placed on the opening of the container and current is placed in the conductive ring. The current in the conductive ring causes heat which causes the lid material to...http://www.google.es/patents/US3968823?utm_source=gb-gplus-sharePatente US3968823 - Lid for a container and a method for sealing the lid on a container
Lid for a container and a method for sealing the lid on a container
