Pre-purification of air for separation
CA 2040348 C · Owner: Jain, Ravi · Inventors: Jain, Ravi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for the pre-purification of air prior to introduction into a cryogenic air separation unit is described. Water vapor and carbon dioxide are substantially removed from air by a pressure swing adsorption (PSA) process utilizing an adsorbent which has an initial layer of activated alumina which comprises from about 70% to 100% by volume of the bed with the remaining layer, if present being a suitable zeolite. The particles of adsorbent particularly the zeolite, have a particle size not greater than two mm. The PSA cycle is particularly suited to the use of such finely particulate adsorbent.
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 April 12, 1991 and granted April 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 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.