Packaging container provided leak-proof tear-open perforations
CA 1109420 A · Owner: Tetra Pak International Ab · Inventors: Holmstrom, Hakan; Ericsson, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a packaging container provided, with a tear-open perforation of the kind which is produced from, a laminate comprising a relatively stiff and unmalleable basic layer, at least one side of which being turned towards the inside of the package has a leakproof unbroken plastic coating said, tear perforation being so arranged that it substantially penetrates the basic layer but without penetrating the plastic layer turned towards the inside of the package, characterized in that said tear perforation along the region on the packaging container where, during the shaping of the package the packaging material, is exposed to folding or some other processing which intensely …
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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 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 22, 1998.
- 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.