Process for removing oxygen from crude argon
CA 2042852 C · Owner: Air Products And Chemicals, Inc. · Inventors: Cook, Philip J.; Chen, Michael S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for purifying argon gas especially an argon gas, stream obtained by cryogenically separating air wherein the argon gas is, heated and compressed and then permeated through a solid electrolyte membrane selective to the permeation of oxygen over other components of the gas and, removing oxygen from the argon by selective permeation of oxygen through the membrane. The purified argon can then be distilled to remove other components such as nitrogen.
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 May 17, 1991 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2013.
- 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.