Method for producing hydrochloromethanes
CA 2086110 C · Owner: Ag Technology Co. Ltd. · Inventors: Tatematsu, Shin; Morikawa, Shinsuke; Yoshitake, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing hydrochloromethanes such as chloroform at high selectivity in high yields by reducing polychloromethanes such as carbon tetrachloride in the presence of a reduction catalyst. It is essential to conduct reduction in liquid phase so as to inhibit effectively the concomitant formation of impurities such as a polymer which deactivates the catalyst whereby the, catalyst can fully develop its high selectivity and activity. As the catalyst at least one element is suitably selected among the group 8, 9 and 10 elements of the Periodic Table such as ruthenium, rhodium, palladium or platinum. Also suitably usable is a catalyst which is based on any of the above elements and …
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 23, 1992 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2014.
- 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.