Method and apparatus for microcellular polymer extrusion
CA 2264159 A1 · Owner: Kim, Roland Y. · Inventors: Cha, Sung W.; Burnham, Theodore A.; Pallaver, Matthew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials including crystalline and , semi-crystalline polymeric microcellular materials are provided. Pressure , drop rate is an important feature in some embodiments and the invention , provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire resulting in a very thin, essentially …
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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 August 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2019.
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Timeline
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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.