Continuous process for the preparation of n-(phosphonomethyl) iminodiacetic acid
CA 2339839 A1 · Owner: Franczyk, Thaddeus S. Ii · Inventors: Johnson, Todd J.; Franczyk, Thaddeus S. Ii; Stern, Michael K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the process of the present invention N-acetyliminodiacetic acid is formed , via a continuous amidocarboxymethylation reaction. In this reaction N-, (acetyl)iminodiacetic acid is formed in an amidocarboxymethylation reactor system, into which a source of each of the following is continuously fed: (1) acetamide or an acetamide derivative (2) formaldehyde or a formaldehyde generator or derivative (3) a carbonylation catalyst (4) carbon monoxide and optionally (5) hydrogen. In turn, an amidocarboxymethylation reaction product stream, which contains N-(acetyl)iminodiacetic acid and the carbonylation catalyst, is withdrawn from the amidocarboxymethylation reactor system. The …
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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 August 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 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
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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.