Packing container with openable, seal-weakened top closure
CA 1308085 C · Owner: Frisk, Peter · Inventors: Andersson, Thorbjorn; Frisk, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packing container comprising a container body consisting of side walls which has been given an arbitray bottom closure and which at the top has been closed by bellowtype folding and heat sealing so as to form a top closure of the gable-top type which can be unfolded to an emptying opening in the form of A pouring spout. To facilitate this re-unfolding certain portions (the areas C and D) of the surfaces which air heat-sealed to one another are coated within the area of the unfoldable part of the top closure with a seal-weakening composition which is based on an aqueous dispersion of a thermoplastics preferably polythene, which is modified by a carboxymethyl cellulose, preferably sodium …
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 September 29, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 2009.
- 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.