Multilayered polymers and foams with variable sized interlayer gaps
CA 2314016 A1 · Owner: National Research Council Of Canada · Inventors: Zhang, Zhiyi; Handa, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention disclosed provides integral multilayered polymers with variable interlayer gaps, and processes for their manufacture. The materials thus produced, consist of many layers of a polymeric material which may be a single polymer , or a, blend of compatible polymers separated by discontinuous narrow gaps containing air, and/or a blowing agent. The layer density can be controlled within a wide range, typically 10 to 2000 layers/mm, while the gap width between the layers can be controlled either to ~ 100 nanometers (called nanolayered polymers) or ~ 1 micrometer (called microlayered polymers) depending on the process. These , layered materials are mechanically strong and have …
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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 July 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2022.
- 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.