Expired Canadian patentCanada
Abatement of hydrogen sulfide with an aldehyde ammonia trimer
CA 2177408 C · Owner: Callaway, Michael · Inventors: Rivers, Gordon T.; Callaway, Michael
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method for scavenging H2S from aqueous and hydrocarbon substrates, preferably natural gas using aldehyde ammonia, trimers.
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 May 27, 1996 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 27, 1996
GrantedDecember 11, 2001
Term endedMay 27, 2016
Patent numberCA 2177408 C
Classification (IPC)C10L3/10 +2 more
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.