Display having light scattering centers
CA 2100336 C · Owner: Wartenberg, F. Mark · Inventors: Jones, J. Phillip; Tomita, Akira; Wartenberg, F. Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A display having (a) a first electrode (7); (b) a second electrode (8); (c) a display medium (4) positioned between the first and second electrodes, which display medium (4) is switchable between a first state in which incident light is at least one of scattered and absorbed and a second state in which the amount of such scattering and/or absorption is reduced; and (d) scattering centers (6) disposed in front of the second electrode for scattering incident light with a scattering half angle of between about 2 and about 40 degrees when the display medium (4) is in its second state while , permitting at least 10 % of the incident light to be transmitted.
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 21, 1992 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2014.
- 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.