Oxidation of toner compositions
CA 2086852 C · Owner: Xerox Corporation · Inventors: Sacripante, Guerino G.; Patel, Raj D.; Kmiecik-Lawrynowicz, Grazyna E.
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 which comprises the oxidation and metal chelation of the surface thereof; and a process for the preparation of toners which comprises the oxidation and metal chelation of the surface thereof and subsequently coalescence by, the absorption or sticking thereto of a fluoro containing polymer.
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 January 7, 1993 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2015.
- 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.