Production process of single crystals
CA 2008024 C · Owner: Mitsui Mining Co. Ltd. · Inventors: Omino, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A single crystal is produced from the melt of a starting material by solidification. The process makes use of a triple-walled crucible composed of an outer cylinder made of a material selected from high-meltingpoint metals and alloys having a melting point of at least 1,500°C, an inner cylinder made of at least one material selected from high-melting-point ceramic materials and carbon materials such as graphite, pyrolytic graphite and vitreous carbon and an intermediate cylinder made of quartz glass. The starting material is charged in the inner cylinder. The inner cylinder with the starting material charged therein is inserted in the intermediate cylinder. The intermediate cylinder with …
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 January 18, 1990 and granted October 19, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2012.
- 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.