Process for preparing lauryllactam through photonitrosation of cyclododecane in the presence of trichloronitrosomethane
CA 2200892 C · Owner: Atofina · Inventors: Ollivier, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a process for preparing a cyclododecanone oxime through photonitrosation of the cyclododecane in the presence of hydrochloric acid. The process is characterized by the fact that the nitrosating agent is trichloronitrosomethane. This invention using trichloronitrosomethane maintains the benefits of photonitrosation while improving selectivity by preventing the formation of chlorine-containing byproducts.
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 March 24, 1997 and granted May 22, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 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.