Method for the manufacture of laminated packing material with gas and aroma barrier properties
CA 2007483 C · Owner: Tetra Pak Holdings And Finance S.A. · Inventors: Frisk, Peter; Lofgren, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the manufacture of a laminated material for the manufacture of packing containers with good gas and aroma barrier properties. The laminated material has a base layer and a layer serving as a gas and aroma barrier. The method comprises coating a first side of a polymer carrier with a 50-500 .ANG. thick barrier layer of silicon dioxide or silicon nitride, by means of vacuum deposition. A second side of the polymer carrier is bonded to a first side of a base layer having first and second sides by, means of an intermediate layer of bonding agent.
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
- Filed January 10, 1990 and granted April 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2012.
- 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.