Process of melting down and purifying silicon
CA 1091426 A · Owner: Wacker-Chemie Gmbh · Inventors: Muschi, Johann; Straussberger, Herbert; Streckel, Willi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of melting down and purifying silicon which comprises melting silicon in at least half of the amount up to double of the amount of a silicate melt heated by resistance heating up to a temperature of at least 1,420°C, said melt consisting of 2 - 30% by weight of calcium oxide, 5 - 35% by weight of magnesium oxide wherein, the sum of calcium oxide and magnesium oxide will be 15 - 38% by weight, 0.5 - 28% by weight of aluminum oxide and 45 - 70% by weight of silicon dioxide, and wherein to the, melt are added at least 0.29% by weight of elementary and/ or chemically bound copper, preferably 0.50 - 3% by weight calculated on the silicon amount.
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
- Granted December 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 1997.
- 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.