Dichroic coloring agents for liquid crystal displays
CA 1290752 C · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Aiga, Hiroshi; Kuroda, Sizuo; Takuma, Keisuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following formula: wherein X is S or NH; R1 is a hydrogen atom halogen, atom, alkyl group or alkoxy group; and R2 is a hydrogen atom, alkyl group, aryl group or aralkyl group.
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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 October 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
- 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.