Conversion of iminodiacetic acid crystal liquors to concentrated solutions of monoalkalimetal iminodiacetate
CA 2026532 A1 · Owner: Thunberg, Jon C. · Inventors: Tiffany, Daniel R.; Thunberg, Jon C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Conversion of iminodiacetic acid crystal liquors to solutions of monoalkalimetal or monoammonium iminodiacetate is disclosed. The process involves adjusting the pH of the IDA liquor to about 6-7 with an alkalimetal or ammonium base and, cooling the solution. Where the starting solution comprises substantial amounts of sodium sulfate, sodium sulfate decahydrate can be separated by cooling the solution to the saturation temperature of sodium sulfate decahydrate.
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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 September 28, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2012.
- 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.