Carbon-containing material
CA 2437331 C · Owner: Knackfuss, Bernd · Inventors: Mcintosh, Ralph; Zoch, Heinz; Fanghaenel, Egon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carbon-containing material with organic groups obtainable by reacting carbon-containing material with organic compounds of the general formula I R1-N=N-R2 (I). The carbon-containing material with organic groups is produced by reacting the carbon-containing material with an organic compound of the general formula I. The material may be used as a filler reinforcing filler, UV stabiliser, conductive carbon black or pigment.
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 August 13, 2003 and granted February 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 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.