Method for the treatment of packing material
CA 1247911 A · Owner: Aktiebolaget Tetra Pak · Inventors: Niske, Jorgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for carrying out along optional regions of a blank or a web of a material comprising at least one layer of paper or cardboard a local thickness reduction of the web or the blank for the purpose of obtaining visible markings or of facilitating the shaping of the material and/or improving the prerequisites for manufacturing packages from the material. The said thickness reduction is achieved by passing the material over one or more die rolls, each being provided with raised portions and by bringing the material by means of the said die rolls into contact with a rapidly rotating grinding wheel with the help of which selected surfaces of the material are ground …
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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 January 3, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 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.