Filler composites
CA 2480098 C · Owner: Schofield, John David · Inventors: Richards, Stuart Nicholas; Schofield, John David; Thetford, Dean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition comprising a plastics material an inorganic particulate solid , such as aluminium trihydrate and a coupling modified of formula A - (X - Y - CO)m (O - B - CO)n OH wherein A is a moiety containing a terminating ethylenic group with one or two adjacent carbonyl groups; Y is a direct bond O or N; Y , is C1-18-alkylene or C2-18 alkenylene; B is C2-6-alkylene; m is from 1 to 4 and n is from 0 to 5 provided that when A contains two carbonyl groups adjacent to the ethylenic group then X is N. Specific examples of coupling modifiers are B-carboxyl ethylacrylate and 5-carboxy pentyl maleimide.
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 February 19, 2003 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.