Method of liquefying natural gas
CA 2035620 C · Owner: Liquid Air Engineering Corporation · Inventors: Garcia, Luc; Nelson, Warren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing a methane-rich liquid stream from a stream of natural gas predominantly consisting o~ methane and also containing nitrogen entailing:, a) supplying said natural gas stream at a pressure above atmospheric pressure, b) cooling and liquefying said natural gas stream using one or more refrigeration cycles and, c) expanding said liquefied natural gas to lower pressure in two or more stages in series phase, separating the gas and liquid phases produced during the expansion, thereby concentrating the nitrogen into the vapor phase, and producing a methane-rich liquefied natural gas.
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 February 4, 1991 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 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.