Process for surface activation and/or devulcanisation of sulphur-vulcanised rubber particles
CA 2521255 C · Owner: Yungwirth, Francis · Inventors: Neumann, Willi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for surface activation and/or devulcanisation of sulphur-vulcanised rubber particles. In order to break the sulphur bridges and to reduce the sulphur, the rubber particles are treated in a biotechnological manner in a medium with mesophilic anaerobic and/or optionally anaerobic and/or microaerophilic bacteria and/or with one or more enzyme systems of such bacteria. The thus treated, activated rubber particles show improved vulcanisation properties, in comparison with non-treated rubber particles and , permit the production of better quality articles.
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 29, 2004 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 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.