Method for dehydrating hydrogen fluoride
CA 1304910 C · Owner: Lester, Joseph E. · Inventors: Lester, Joseph E.; Folweiler, Robert C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A method for controlling the water present in hydrogen fluoride is described which effectively removes all the water contained in the hydrogen fluoride solution to form other compounds that either have extremely low vapor pressure or are acceptable in a process such as chemical vapor purification. The method involves as one of the steps the contacting of a reactive metal halide with a hydrogen fluoride containing water. The metal halide reacts with the water contained in the hydrogen fluoride solution yielding a metal oxide hydrogen, halide, and anhydrous hydrogen fluoride. The metal oxide is a solid, with low vapor pressure, thereby effectively removing oxygen-bearing species …
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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
- Granted July 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 2009.
- 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.