Phosphoric esters as emulsifiers and dispersants
CA 2350765 A1 · Owner: Heilen, Wernfried · Inventors: Esselborn, Eberhard; Lehmann, Kathrin; Stuttgen, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the use of particular phosphoric esters as emulsifiers and dispersants for pigments and fillers, based on polystyrene-block (b)-polyalkylene oxide copolymers. The invention provides block copolymeric phosphoric esters and their salts of the general formula (I) (See formula I), where, R1 - a straight-chain or branched or cycloaliphatic radical having 1 to 22 carbon atoms, SO = styrene oxide EO = ethylene oxide, BO = butylene oxide and a = 1 to < 2, b = 3 to 100, c = 0 t0 10 d = 0 to 3, where b ~ a+c+d.
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
- Filed June 14, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 14, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 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.