Method of producing stabilized organic pigment particles and device therefor
CA 2455047 A1 · Owner: Hohman, James L. · Inventors: Hohman, James L.; Witman, Sandra L.; Yeh, An-Gong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing self dispersible organic pigment particles stabilized by the method. The method includes modifying organic pigment particles and then contacting the surface modified particles with an aqueous vapor entrained in a carrier gas to produce the stabilized organic pigment particles. Typically the pigment particles are modified by exposing their surfaces to ozone or a plasmaactivated process gas. The surface stabilizing method prevents the violent exothermic reaction, which occurs when surface modified pigment particles are exposed to ambient air. The method is accomplished in a device which includes , a reactor, means for introducing in the reactor aqueous vapor …
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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 August 23, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2024.
- 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
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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.