Deeply reduced oxidation catalyst and its use for catalyzing liquid phase oxidation reactions
CA 2610653 C · Owner: Pharmacia Corporation · Inventors: Rogers, Peter E.; Ebner, Jerry R.; Wan, Kam-To
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of N-(phosphonomethyl)glycine or a salt thereof the process comprising contacting N--(phosphonomethyl)iminodiacetic acid or a salt thereof with an oxidation catalyst in a solution or slurry having a pH less than 7 and in the presence of oxygen wherein the catalyst comprises a carbon support having a noble metal and at least one promoter at a surface of the carbon support the noble metal is selected from the group consisting of platinum palladium, ruthenium, rhodium, iridium silver, osmium, gold and combinations thereof and the promoter is selected from the group consisting of tin bismuth, lead, cadmium, magnesium, manganese …
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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 February 17, 1999 and granted May 29, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2021.
- 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.