Process and apparatus for producing nitrogen from air
CA 2021444 C · Owner: The Boc Group, Inc. · Inventors: Mostello, Robert A.; Parker, Clayton E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the recovery of nitrogen from air in which gaseous air is compressed, cooled and optionally purified in a heat exchanger, and then distilled to obtain pure gaseous nitrogen overhead and an oxygen enriched liquid bottoms, wherein all of the bottoms and a portion of the overhead is passed to a condenser to form an oxygen enriched gas and liquid nitrogen and wherein at least a portion of the oxygen enriched gas is compressed and recycled to the distillation column to enhance recovery of the nitrogen product.
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 July 18, 1990 and granted September 14, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2012.
- 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.