Aqueous synthesis of iodopropargyl carbamate
CA 2269760 C · Owner: Troy Corporation · Inventors: Nowak, Milton
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is direct to a method for making an iodopropynyl carbamate in an aqueous reaction medium so as to yield a more pure and stable e.g. U.V. , resistant, product in a high yield free from environmental hazards posed by using nonaqueous, solvents as the reaction medium. Iodoalkynyl carbamates have the following generic, formula:-
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 29, 1997 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 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.