Process for purifying chlorosilanes
CA 1189286 A · Owner: Dynamit Nobel Aktiengesellschaft · Inventors: Vahlensieck, Hans-Joachim; Kotzsch, Hans-Joachim; Matthes, Reinhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for purifying chlorosilanes of impurities contained therein. These impurities are boron compounds and compound of metals. This process is characterized in that the chlorosilanes in liquid phase are brought into intimate contact with a compound which contains one or several Si-O-Si linkages in the presence of hydrogen halide and subsequently the chlorosilane thus purified is separated from the non-volatile boron or metal compounds thereby formed by distillation. Purified SiHCl3 according the within process is needed to manufacture polycrystalline or monocrystalline silicon which is used for semi-conductor purposes. Purified SiCl4 without metal …
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 June 25, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 25, 2002.
- 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.