Black electrophoretic particles and method of manufacture
CA 2176482 C · Owner: Hou, Wei-Hsin · Inventors: Hou, Wei-Hsin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention are dielectric black particles (22) for use in electrophoretic images displays (10) electrostatic toner or the, like, and the corresponding method of manufacturing the same. The present invention black particles (22) are latex particles formed by a polymerization technique, wherein the latex particles are stained to a high degree of blackness with a metal oxide.
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 12, 1994 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 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.