Electro-optic display methods
CA 1099809 A · Owner: Eastman Kodak Company · Inventors: Bucher, Hermann K.; Goodwin, Robert M.; Klingbiel, Richard T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electro-optic display is provided which uses a liquid crystalline composition (a) having a positive zero frequency dielectric anisotropy and (b) exhibiting a dielectric anisotropy inversion at a crossover audio frequency of an applied field. Illuminating such a composition and simultaneously subjecting it alternately to an electric field of a first audio frequency below the crossover frequency and an electric field of a second audio frequency above the crossover frequency causes alteration of the molecular orientation and optical properties of the composition so as to modulate the incident radiation.
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
- Granted April 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 1998.
- 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.