Toner
CA 2018371 C · Owner: Yoshida, Keiji · Inventors: Takahiro, Syuji; Funato, Ryo; Kubo, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention as described herein provides a toner comprising a polymeric binder obtainable by suspension polymerisation of a mixture of vinyl monomers including both styrene or a styrene derivative and a (meth) acrylic ester, and an acid vinyl monomer in an amount of 0.5 to 10 wt. % based on the total weight of the vinyl monomers the, polymerisation being carried out using a non-ionic dispersing agent and an azo initiator. The toner of the present invention produces copied images having excellent stability of image quality (life) even after a large number of times of copying.
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 6, 1990 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2012.
- 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.