Process for absorption of sulfur compounds from fluids using ethylene diamine derivatives
CA 2049152 A1 · Owner: Christiansen, Steven H. · Inventors: Chang, Dane; Wilson, David A.; Christiansen, Steven H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing SO2 from a fluid containing SO2 by employing as an absorbent for the SO2 an admixture of water and a compound represented by Formula I: Formula I, wherein each R1, R2 or R3 is independently hydrogen; an alkyl group; a carboxylic acid group; a hydroxyalkyl group; an aldehyde group; an alkyl group containing a carboxylic ester, a carboxylic acid or salt, ether aldehyde, ketone or, sulfoxide group; wherein at least one R1 or R3 is carboxy methyl group and at least one R1 or R3 is hydrogen preferably at least one R1 is carboxy methyl and at least one R3 is hydrogen. The absorbent solution preferably can be thermally regenerated by heating to remove SO2. 38,273-F
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 August 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 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.