Coal-water mixtures from low rank coal and process of preparation thereof
CA 2129151 C · Owner: Szymocha, Kazimierz · Inventors: Caldiero, Loredana; Szymocha, Kazimierz; Ignasiak, Boleslaw
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a coal-water fuel from a low rank coal. The first step of the process provides for an aqueous slurry containing particles of the low rank coal. A quantity of an agglomerating agent in the range of about 10% to 30% weight to dry ash - free low rank coal weight is added to the slurry to produce a mixture. The mixture is then agitated to form agglomerates. Following separation of the agglomerates, the agglomerates are contacted with steam or an inert gas having a temperature in the range of about 250°C to 420°C at substantially atmospheric pressure to produce partially deoiled agglomerates containing less than about 7% by weight of residual bridging liquid and having a …
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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 July 29, 1994 and granted December 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.