Regeneration of hydrogen sulfide scavengers
CA 2220595 C · Owner: Cherry, Doyle · Inventors: Cherry, Doyle
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention generally provides sulfide scavenger solutions and processes that have high sulfide scavenging capacity provide a reduction or elimination of solids formation and avoid the use of chemicals that pose environmental concerns. The invention utilizes a dialdehyde, preferably ethanedial for the purpose of reacting with amines amine, carbonates, or other derivatives of amines that are liberated when certain scavenger solutions react with sulfides, including hydrogen sulfide and mercaptans. The scavenger solutions that have been discovered to liberate amines are those formed by a reaction between an amine and an aldehyde.
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 12, 1997 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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.