Production of packaging material web with longitudinal edge impregnated with the reaction product of a vinyl polymer and a werner complex
CA 1061196 A · Owner: Tetra Pak International Ab · Inventors: Thomas, Manuel A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method of producing a packaging material web for use in producing packages to contain liquids, which comprises rolling the packaging material which includes at least one fibrous wicking layer into a storage roll with exposed edges of the web localized in a plane coincident with the sides of the roll and coating at least one side of the roll with an aqueous composition comprising a halometallic complex of the Werner type and a vinyl polymer having reactive groups for said complex, whereby said composition is wicked into said wicking layer at the exposed edges of the web forming a, liquid-tight impregnation. The packaging material web so obtained is suitable …
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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 August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- 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.