Process for producing hydrogen fluoride
CA 1191017 A · Owner: Asahi Glass Company Ltd. · Inventors: Kitasako, Masayuki; Nakaya, Keiichi; Suzuki, Kaichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing hydrogen fluoride with use of fluorite as starting material and by conducting reactions in a first reactor and a second reactor wherein a reaction of fluorite with sulfuric acid sulfuric anhydride and steam in the first reactor is conducted at a conversion of from 35 to 90% while maintaining the reaction temperature within a range of from 140 to 240°C by controlling the respective amounts of the sulfuric anhydride, steam and sulfuric acid.
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 July 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 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.