Patent US4744635A successfully refreshed from Google Patents.
US4744635A
Expired / Lapsed
US
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Color filter with a porous activated film layer having dye fixed in the minute pores to form color or pattern
Assignee: Nissha Printing Co Ltd
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Filing: 1987-09-01
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Granted: 1988-05-17
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Expires: 2007-09-01
Abstract
Abstract The color filter of this invention comprises a transparent substrate, a porous activated film layer formed on the substrate and made of activated alumina or activated silica or a mixture thereof, a colored area or a pattern formed by the dye fixed in the minute pores of the activated film layer, and a coating layer sealingly closing the upper portions of the minute pores of said activated film layer. This color filter is relatively simple and easy to manufacture, superior in resistivity to heat, water, chemicals, solvents, etc. and suitable for use as a color filter in various display devices, particularly liquid crystal display devices.
Inventors
- 👤 Minoru Takaochi
- 👤 Kozo Matsumura
- 👤 Takao Sumi
- 👤 Kenichi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/133516
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
A color filter comprising a transparent substrate, a porous activated film layer formed on the substrate and made of activated alumina or activated silica or a mixture thereof, a colored portion or pattern formed of a dye fixed in the minute pores of the activated film layer, and a coating layer sealing the upper portions of the minute pores of said activated film layer.
Claim 2
Dependent Claim
64 words
A color filter comprising a transparent substrate, a porous activated film layer formed on the substrate and made of activated alumina or activated silica or a mixture thereof, a colored portion or pattern formed of a dye fixed in the minute pores of the activated film layer, and a coating layer sealing the upper portions of the minute pores of said activated film layer.
Claim 3
Dependent Claim
21 words
The color filter described in claim 1 wherein the thickness of said activated film layer is 0.5 μm to 10 μm.
Claim 4
Dependent Claim
31 words
The color filter described in claim 1 wherein the dye in the minute pores of said activated film layer consists substantially of a sublimable dye and/or a thermo-diffusible and evaporable dye.
Claim 5
Dependent Claim
26 words
The color filter described in claim 1 further including a transparent electrically conductive film of a desired pattern formed so as to cover said coating layer.
Claim 6
Dependent Claim
65 words
The color filter described in claim 4 wherein patterns of more than two colors are formed by dyes, and said transparent electrically conductive film comprises patterns each corresponding to the pattern of each of said colors, and the pattern of each of said colors and the corresponding one of the patterns of said electrically conductive film are formed at positions accurately coinciding with each other.
Claim 7
Dependent Claim
29 words
The color filter described in claim 5 wherein said coating layer is made of a resin having a high adhesivity to the material constituting said transparent electrically conductive film.
Claim 8
Dependent Claim
29 words
The color filter described in claim 4 wherein said coating layer is made of a resin having a high adhesivity to the material constituting said transparent electrically conductive film.
Claim 9
Independent Claim
75 words
A method for forming a color filter which comprises: applying a layer of colloidal alumina or silica or a mixture thereof on transparent substrate; thereafter drying then sintering the layer to form thereby a transparent activated film layer on said substrate with a number of minute pores therein; thereafter applying a dye to said activated film layer uniformly or in a pattern; and, subsequently applying a transparent sealing coating over the dyed activated film layer.
Claim 10
Independent Claim
75 words
A method for forming a color filter which comprises: applying a layer of colloidal alumina or silica or a mixture thereof on transparent substrate; thereafter drying then sintering the layer to form thereby a transparent activated film layer on said substrate with a number of minute pores therein; thereafter applying a dye to said activated film layer uniformly or in a pattern; and, subsequently applying a transparent sealing coating over the dyed activated film layer.
Claim 11
Dependent Claim
17 words
The method of claim 8 further comprising placing a transparent electrically conductive film over said sealing coating.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein the thickness of said activated film layer is in the range of 0.5 μm to 10 μm.
Claim 13
Dependent Claim
48 words
The method of claim 8 further comprising applying dye in patterns of at least two colors to said activated film layer and applying thereover a transparent electrically conducting film with patterns thereon corresponding to each dye color with the color pattern of electrically conductive film pattern in registry.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |