Method for ecological utilization of acid effluents
CA 2134970 A1 · Owner: Eisenschmid, Wolfgang · Inventors: Eisenschmid, Wolfgang; Hahn, Reinhard; Buckl, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is an invention for the ecological usage of acid effluents while producing a sorption agent and which is characterized by the fact that an acid effluent of the production of fullers earth containing as main ingredients Fe2+/3+- Al3+-, Ca2+- and Mg2+ cations and, inorganic anions are reacted using an alkali silicate. The remaining precipitate is separated from the aqueous phase and, when necessary purified and dried. The sorption agent can be used for the bleaching of oils or for the removal of soaps phospholipids and heavy metals, from oils specifically edible oils.
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 March 1, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 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.