Liquid absorbent solutions for separating nitrogen from natural gas
CA 2202239 C · Owner: Miller, Warren K. · Inventors: Babcock, Walter C.; Miller, Warren K.; Edlund, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nitrogen-absorbing and -desorbing compositions novel ligands and transition metal complexes and methods, of using the same, which are useful for the selective separation of nitrogen from other gases especially, 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 April 9, 1997 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2019.
- 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.