Means for separating out noxious substances from gases and exhaust gases, a process of making said means and a process employing said means
CA 2015974 C · Owner: Ftu Gmbh Forschung Und Technische Entwicklung Im Umweltschutz · Inventors: Suchenwirth, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition for separating out volatile pollutants from gases and exhaust gases comprising calcium hydroxide and water-soluble salts of sulfur-containing compounds, e.g. mercaptans sulfides, polysulfides, polythionates and thiosulfates or elementary sulfur which are used in combination with surfaceactive, substances. Possible ways to produce the composition include adding the sulfur-containing compounds to quicklime during slaking to the slaking water , or, subsequent to slaking to calcium hydroxide. The compositions are used for removing the volatile heavy metals, particularly mercury arsenic, cadmium, thallium, antimony and lead at temperatures ranging from 0 ° C to 400 ° C. For, …
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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 May 2, 1990 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2012.
- 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
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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.