Synthesis of methylmercaptan from dimethyldisulfide
CA 2133808 C · Owner: Arretz, Emmanuel · Inventors: Cadot, Emmanuel; Lacroix, Michel; Arretz, Emmanuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention involves a process for manufacturing methyl mercaptan by catalytic hydrogenation of dimethyl disulfide in the presence of a sulfide-based catalyst consisting of at least one transition metal. This process takes place in the presence of water and/or hydrogen sulphide which significantly enhances methyl mercaptan selectivity.
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 October 6, 1994 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2016.
- 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.