Method for preparation of n-phosphonomethylglycine
CA 1205487 A · Owner: Stauffer Chemical Company · Inventors: Subramanian, N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A method for the production of N-phosphonomethylglycine is disclosed which comprises the steps of:, (a) reacting formaldehyde with formamide at a pH of 9-10 to form N-(hydroxymethyl)formamide, (b) reacting N-(hydroxymethyl)formamide with triethylphosphite to form diethyl, N-(formyl)aminomethylphosphonate (c) reacting diethyl, N-(formyl)aminomethylphosphonate with methylchloroacetate to form N-(diethylphosphonomethyl) N-(formyl)glycine-, methyl ester, and, (d) reacting N-(diethylphosphonomethyl) N-(formyl)glycine-, methyl ester with hydrochloric acid to form N-phosphonomethylglycine.
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
- Granted June 3, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 3, 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.