Microcellular polymer foams and method for their production
CA 2359956 A1 · Owner: Tan, Seng C. · Inventors: Tan, Seng C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An environmentally friendly, commercially practicable process for the production of microcellular polymer foams from amorphous semi-crystalline and , crystalline polymers that comprises consolidating the polymer into a polymer shape, saturating the polymer shape with an inert gas at elevated temperature above the Tg of the polymer, and under elevated pressure releasing the , pressure and cooling, i.e. quenching the saturated polymer shape under , controlled temperature and pressure conditions to produce either a closed or open celled, low to medium density microcellular foam or a closed cell high , density microcellular foam.
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 19, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 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.