Expired Canadian patentCanada
Intermediates for the preparation of vitamine a and carotenoids and their process of preparation
CA 2131592 C · Owner: Rhone-Poulenc Nutrition Animale · Inventors: Bienayme, Hugues
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel intermediates of the preparation of vitamin A and carotenoids of the following formula (I): (see Fig. I) a process for their preparation and their use.
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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 September 7, 1994 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 7, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 7, 1994
GrantedDecember 1, 1998
Term endedSeptember 7, 2014
Patent numberCA 2131592 C
Classification (IPC)C07C47/21 +2 more
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.