Methods for closing containers
CA 1249779 A · Owner: Metal Box Plc · Inventors: Perigo, John A.; Tucker, Geoffrey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packing container is closed by using a double seam (152) to secure over the container body (70) a cover (74) of smaller diameter than is usual, creating a radial space (104) around the cover chuck wall (122) into which the body sidewall (72) is deformed to form a neck (76). The cover is intially placed on the body to form a sealable interface (142) therebetween, this interface being preserved throughout the seaming process. The body and/or the cover may be of plastics or metal or a laminated material. In an aseptic packaging process, a primary seal is created at the interface (42) under sterile conditions seaming, subsequently being carried out under non-sterile conditions.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.