Method for making spherical adsorbent particles
CA 2192548 C · Owner: Bio-Technical Resources Lp · Inventors: Smiley, Leonard Harris; Witt, Reinhard Herbert; Derolf, Mahlon Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to an unsintered spherical adsorbent particle composition having high mechanical strength and controlled pore size distribution, comprising finely divided silica hydrogel particles bonded together with a silica or metal oxide sol.
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 16, 1995 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2017.
- 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.