Laminates of films and methods and apparatus for their manufacture
CA 2448034 C · Owner: Rasmussen, Ole-Bendt · Inventors: Rasmussen, Ole-Bendt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible laminate of films of thermoplastic polymer material comprises fluted ply A and substantially flat ply B adhered to one another at the , crests of A in contact with B. The wavelength of the flutes is preferably no more than 3mm. The thickness of A is generally the same within the non-bonded zones as it is within the bonded zones or A has attenuated zones extending parallel to the flute direction, each bonding zone being mainly located within a first attenuated zone. Apparatus for forming the laminate comprises aligned grooved fluting rollers and grooved laminating roller. The laminate has useful mechanical characteristics, as a flexible material e.g. when formed into bags , …
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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
- Filed June 14, 2002 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2024.
- 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.