Expired Canadian patentCanada
Process for the preparation of hexamethylene imine
CA 2004456 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Atadan, Erdem M.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of hexamethylene imine from hexamethylene diamine by the vapor phase reaction in the presence of water, hydrogen and a, palladium catalyst.
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 1, 1989 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 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.
FiledDecember 1, 1989
GrantedAugust 4, 1998
Term endedDecember 1, 2009
Patent numberCA 2004456 C
Classification (IPC)C07D295/02
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.