Purified attapulgite clay
CA 2429185 A1 · Owner: Sampson, Paul · Inventors: Sampson, Paul; Purcell, Robert J. Jr.; Parker, Dennis C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing an attapulgite clay (Fuller's Earth) that significantly removes other types of clays and minerals resulting in improved performance. , A unique dispersant is used that will fully disperse the individual attapulgite particles in water such that the particles remain in suspension and said dispersant will not fully disperse other clay and mineral species which then can be easily separated through various techniques. The attapulgite clay may be recovered from the dispersion and dried in such a manner to produce a finely sized powder from ore without the need for any grinding or , milling operation. The dried attapulgite clay has a free moisture content of 2- 3 %. The …
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 October 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2022.
- 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.