Materials for growing algae and artificial reefs
CA 2274104 C · Owner: Saiki, Masamichi · Inventors: Watanuki, Akira; Hirose, Norikazu; Aota, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vitreous materials for growing algae from which ferric ions can be stably eluted over a long time while regulating the elution time to the desired period by controlling the particle size thereof; materials for growing algae prepared by molding the above-mentioned materials into porous ones; and artificial fishing banks involving these materials as at least a part of the same. These materials are characterized by containing as the major components from 15 to 50 % on the weight basis, of , SiO2, from 1 to 35 % of either or both of Na2O and K2O from, 30 to 70 % of B2O3, and from 1 to 40 % of either or both of Fe O and Fe2O3 and ferric ions can be easily eluted therefrom owing to the …
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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 December 4, 1997 and granted February 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2019.
- 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.