Auxiliaries for the filtration and/or dewatering of mineral and coal suspensions
CA 2085357 A1 · Owner: Koester, Rita · Inventors: Von Rybinski, Wolfgang; Koeppl, Dieter; Koester, Rita
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A b s t r a c t, Auxiliaries for the filtration and/or dewatering of mineral and coal suspensions, In the filtration and/or dewatering of water from mineral or coal suspensions, the dewatering time is shortened and filter cakes having low residual moisture contents are obtained by the addition of alkyl and/or alkenyl polyalkylene glycol ethers as filtration aids.
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 June 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2013.
- 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.