Toner processes
CA 2126592 C · Owner: Kmiecik-Lawrynowicz, Grazyna E. · Inventors: Patel, Raj D.; Kmiecik-Lawrynowicz, Grazyna E.; Hopper, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of toner compositions with controlled particle size comprising:, (i) preparing a pigment dispersion in water which dispersion, is comprised of a pigment an ionic surfactant in amounts of from about 0.5 to about 10 percent by weight of water and an optional charge control, agent; (ii) shearing the pigment dispersion with a latex mixture comprised of a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant, a nonionic surfactant and resin, particles, thereby causing a flocculation or heterocoagulation of the formed particles of pigment, resin, and charge control agent; (iii) stirring the resulting sheared viscous mixture …
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 23, 1994 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2016.
- 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.