Process for purification of 1,2-bis (nicotinamido) propane
CA 2006665 C · Owner: Iwaoka, Tomoyasu · Inventors: Iwaoka, Tomoyasu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for purifying crude 1, 2-bis(nicotinamido)propane obtained by the reaction of nicotinic acid with 1,2-propanediamine. This process comprises forming 1,2-bis(nicotinamido)propane dinitrate from the crude 1,2-bis(nicotinamido)propane suspending the, dinitrate in an organic solvent adding an alkali or an, alkaline solution to the suspension to dissociate the free 1,2-bis(nicotinamido)propane, extracting it from the suspension with a solvent, and removing the solvent to isolate the purified product. According to this process crude 1, 2-bis(nicotinamido)propane can be efficiently purified to give the product having a high purity.
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 December 27, 1989 and granted February 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2011.
- 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.