Method for capturing ecologically harmful substances from material polluted with such substances
CA 2124539 A1 · Owner: Pelt & Hooykaas B.V. · Inventors: Hooykaas, Carel Willem Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for capturing ecologically harmful substances, both of organic and inorganic nature by absorbing these substances on a zeolite or on a swellable, layered clay which has been modified with hydroxyaluminium to form an aluminium-rich zeolite or a pillared clay containing pillars of aluminium hydroxide complexes, said aluminium-rich zeolite or aluminiumpillared cationic or anionic clay having been treated prior to the absorption, with a salt of an inorganic acid preferably with a phosphate. If the treatment is carried out with a salt of a rare earth element superpillars are, formed in the clay, as a result of which a clay having a great absorbency in addition to a large …
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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 27, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2016.
- 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.