Compound with base of an alkaline-earth, sulphur and aluminium, gallium or indium, method of preparing same and use as luminophore
CA 2270577 C · Owner: Macaudiere, Pierre · Inventors: Macaudiere, Pierre; Huguenin, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a compound with a base of an alkaline-earth sulphur and aluminium, gallium or indium method for preparing same and use as luminophore. The compound is of formula AB¿2?S¿4? in which A represents an alkaline-earth B aluminium, gallium or indium, and it is characterised in that it is in the form of a powder residual content of oxygen not more than 1.5 % and consists of particles of average size not more than 10µm. This compound is obtained by a method consisting in the following steps: forming a solution or a suspension containing salts of elements A and B drying the solution or suspension by pulverisation; reacting the product obtained from the preceding step with …
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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 28, 1997 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 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
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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.