Manufacture of articles from fly ash
CA 2539627 C · Owner: Newsouth Innovations Pty Limited · Inventors: Shaw, Karl John; Kayali, Obada
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method of forming a shaped article having a matrix that contains sintered fly ash. The method comprises the step of blending fly ash together with water to produce a fly ash dough. The water is added in excess of that which is absorbed by the fly ash so that the dough contains free water so as to be in at least a partially fluid state. The method also comprises the steps of forming a green article in a desired shape from the fly ash dough, and removing at least a portion of the free water from the fly ash dough during and/or after forming of the green article. The green article is subsequently fired so that the shaped article is hardened by …
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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 November 17, 2003 and granted April 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 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.