Reflux condenser cryogenic rectification system for producing lower purity oxygen
CA 2254635 C · Owner: Praxair Technology, Inc. · Inventors: Bonaquist, Dante Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for directly producing lower purity oxygen with high recovery, employing a non-adiabatic distillation device within a distillation column to provide high purity liquid nitrogen reflux to the upper section of the column. This invention provides for a variety of feed air options to the non-adiabatic distillation device and to the distillation column.
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 November 30, 1998 and granted October 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2020.
- 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.