Expired Canadian patentCanada
Basic magnesium carbonate, production method and use of the same
CA 2476540 C · Owner: Tanabe, Katsuyuki · Inventors: Tagami, Naoki; Tanabe, Katsuyuki; Mitsuhashi, Kohei
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Basic magnesium carbonate comprising a tubular aggregated particle of flaky fine crystals.
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 12, 2003 and granted August 28, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 12, 2003
GrantedAugust 28, 2012
Term endedFebruary 12, 2023
Patent numberCA 2476540 C
Classification (IPC)C01F5/24 +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.