Expired Canadian patentCanada
Use of rare earth compounds for the prevention of kidney stone disease
CA 2442414 C · Owner: Idzan, Stefan R. · Inventors: Idzan, Stefan R.; Abrams, Michael J.; Bridger, Gary J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Conditions such as kidney stones, which are characterized by undesired absorption of oxalate from the intestinal tract are conveniently treated using nontoxic salts of rare earth metal ions.
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 April 22, 2002 and granted February 1, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 22, 2002
GrantedFebruary 1, 2011
Term endedApril 22, 2022
Patent numberCA 2442414 C
Classification (IPC)A61K31/28 +2 more
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.