Coated activated carbon
CA 2298232 A1 · Owner: Tolles, Edward D. · Inventors: Walker, David R. B.; Tolles, Edward D.; Hiltzik, Laurence H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for application of a polymer coating on a granular or shaped activated carbon to essentially eliminate or to significantly reduce product attrition by dusting without a reduction in adsorption velocity or capacity of the activated carbon. After the polymer coating has dried any residual carbon dust is removed. New products resulting from the disclosed process also are disclosed.
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 February 9, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 9, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 9, 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.