Method for reprocessing dust or dust mixtures
CA 2398349 A1 · Owner: Holcim Ltd. · Inventors: Edlinger, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for reprocessing dust or dust mixtures containing alkalis and heavy metals such as e.g. steel works dust ore dusts , or blast furnace dust. According to said method the dust is introduced onto , or into a bath consisting of liquid metals and liquid oxidic slag especially , by blasting. Volatile heavy metal compounds such as e.g. Zn- and/or Pb oxide are separated off from the gas phase and alkalis are introduced into slag.
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 January 18, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 18, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2023.
- 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.