Method for preparation of n-phosphonomethylglycine
CA 1205817 A · Owner: Stauffer Chemical Company · Inventors: Bowler, Donald J.; Bayer, Arthur C.; Robbins, Jeffrey D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention, Disclosed is a method for the preparation of N-phosphonomethylglycine which comprises the steps of (a) reacting hydantoin or a 3-substituted hydantoin, a compound of the formula wherein R is selected from the group consisting of hydrogen alkyl having, from 1 to 10 carbon atoms aryl having from 6 to 12 carbon atoms, alkylcarbonyl wherein the alkyl group has from 1 to 10 carbon atoms and aryl-, carbonyl wherein the aryl group has from 6 to 12 carbon atoms with para-, formaldehyde in the presence of a low molecular weight carboxylic acid at a temperature and for a sufficient period of time to produce a mixture of intermediate products, including the 1-hydroxymethyl …
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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
- Granted June 10, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 2003.
- 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.