To enhance the thermal insulation of polymeric foam by reducing cell anisotropic ratio and the method for production thereof
CA 2486159 C · Owner: Weekley, Mitchell Z. · Inventors: Weekley, Mitchell Z.; Breindel, Raymond M.; Miller, Larry M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a closed cell polymeric foam material comprising: a polymer having , a weight average molecular weight of from approximately 30,000 to 500,000; and a , blowing agent, the blowing agent comprising at least one of a fully or partially , halogenated hydrocarbon, an aliphatic alcohol and carbon dioxide; wherein the , cell orientation ratio of the polymeric foam material in the x/z direction is from approximately 0.5 to 0.97 and anisotropic ratio range is from 1.6 to 1.03.
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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 May 12, 2003 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2025.
- 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.