High-activity and high-dispersibility magnesium hydroxide and process for the production thereof
CA 2000384 A1 · Owner: Hirose, Toru · Inventors: Hirose, Toru; Anabuki, Hitoshi; Miyata, Shigeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnesium hydroxide having a BET specific surface area of 20 to 50 m2/g, a 50 percent diameter as a secondary, particle, of not more than 1.5 µm and a 90 percent diameter as a secondary particle, of not more than 4.0 µm and, a process for the production of a magnesium hydroxide which comprises heating, a basic magnesium chloride or nitrate represented by formula, Mg(OH)2-xAx?mH2O, wherein A represents Cl or NO3 x is in the range of, 0<x<0.2, and m represents a number of from 0 to 6 and having main spacings of 8.2.ANG. 4.1.ANG. 2.7.ANG. 2ØANG. 1.56.ANG. and 1.54.ANG. measured by X-ray diffraction in reaction mother liquor of the basic magnesium chloride or nitrate under atmospheric …
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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 October 10, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2011.
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Timeline
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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.