Preparation of iminodiacetic acid compounds from monoethanolamine substrates
CA 2408839 A1 · Owner: Arhancet, Juan P. · Inventors: Peterson, James C.; Franczyk, Thaddeus S.; Berk, Howard C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a process for making an iminodiacetic acid compound from a monoethanolamine compound having the following formula (I) wherein R1 is hydrogen, hydrocarbyl, or substituted hydrocarbyl. In one embodiment, the process comprises contacting the monoethanolamine substrate with a cyanide source and a formaldehyde source to form a N-cyanomethylated monoethanolamine intermediate, and contacting the N-cyanomethylated monoethanolamine intermediate with a hydroxide source and a metal-containing catalyst to form the iminodiacetic acid compound.
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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 May 15, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2023.
- 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.