Filters for electronic display devices
US7521562B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2005 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Nov 13, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/007
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a filter for electronic display devices, comprising a squarylium compound represented by General Formula (I):[wherein R1 and R2 may be the same or different and each represents a hydrogen atom, an alkyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s), or a heterocyclic group optionally having substituent(s); X represents a group represented by following Formula (A):(wherein R3 and R4 may be the same or different and represents a hydrogen atom, an alkyl group optionally having substituent(s), an alkoxy group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s), or a heterocyclic group optionally having substituent(s), wherein R3 and R4 may be combined together with the adjacent nitrogen atom thereto form a heterocyclic group optionally having substituent(s))].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.