Sheet material
CA 2080335 C · Owner: Marketech Limited · Inventors: Mackinnon, Robin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic sheet material comprises a pair of opposed faces (12 14)between , which run a series of elongate voids (16) the, voids being arranged such that there are a series of uninterrupted interconnections (18) between the two opposite faces. The voids are of a cross sectional shape such that there is a substantial absence of sharp corners. Where the voids are not in themselves round the corners are radiussed (24). In a preferred construction two series of interconnections are provided which join one another where they meet (20). The construction is particularly useful in packaging, especially the packaging of food products it has, high buckling resistance in both the machine and …
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 April 12, 1991 and granted January 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2013.
- 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.