Sulphur monoclinic compounds production process
CA 2035185 C · Owner: Colombet, Pierre · Inventors: Spiesser, Michel; Colombet, Pierre; Molinie, Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns a process for synthesizing binary sulphur compounds selected from among the rare earth sulphur compounds and transition metals. It consists in initiating a reaction between a rare earth compound that is, a transition metal oxide, and a carbonaceous compound of sulphur in the gaseous state. It is unique in that the entire reaction is carried out in a closed compartment and uses a rare earth compound or transition metal oxide in solid form. The products obtained are either superior rare earth sulphides or rare earth sesquisulphides.
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 January 29, 1991 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 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.