Amino alkylene phosphoric acid resins, their use and preparation
CA 1061945 A · Owner: Diamond Shamrock Corporation · Inventors: Grammont, Paul D. A.; Carbonel, Jack; Herbin, Jean E. E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is an ion exchange resin prepared from a cross-linked vinyl-aromatic polymer carrying recurring active units of the formula -CH2NHRPO(OH)2 wherein R is a lower alkylene radical. Such resins are useful in selectively removing metal ions from solutions and may be pre-, pared, e.g. by reaction of a primary amino-substituted cross-linked copolymer with a phosphorus trihalide and a simple (C1-C3) aldehyde.
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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 September 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 4, 1996.
- 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.