Expandable vinylaromatic polymers and process for their preparation
CA 2519911 C · Owner: Zamperlin, Loris · Inventors: Simonelli, Alessandra; Ponticiello, Antonio; Zamperlin, Loris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Expandable vinylaromatic polymers which comprise: a) a matrix obtained by polymerizing 50-100 % by weight of one or more vinylaromatic monomers and 0-50 % by weight of a copolymerizable monomer; b) 1-10 % by weight calculated with , respect to the polymer (a) of an expanding agent englobed in the polymeric matrix; c) 0.01-20 % by weight, calculated with respect to the polymer (a) of carbon black distributed in the polymeric matrix having an average diameter ranging from 30 to 2000 nm, a surface area ranging from 5 to 40 m2/g a sulfur , content ranging from 0.1 to 2000 ppm and an ash content ranging from 0.001 to 1 %.
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 March 11, 2004 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2026.
- 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.