Utilization of maleic acid copolymers as inhibitors of calcium oxalate coatings
CA 2375338 A1 · Owner: Kistenmacher, Axel · Inventors: Seufert, Michael; Potthoff-Karl, Birgit; Deubig, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the utilization of copolymers as inhibitors of calcium oxalate coatings, containing the following polymerized components: a) 10 to 80 % by weight percent maleic acid and/or maleic acid anhydride; b) 20 to 90 % by weight acrylic acid and c) 0 to 20 % by weight of at least one additional monomer which can be copolymerized with monomers (a) and (b) and having an average molecular weight ranging between 25,000 and 250,000.
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 May 24, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 24, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 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.