Patent US5707738A successfully refreshed from Google Patents.
US5707738A
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Black electrophoretic particles and method of manufacture
Assignee: AUO Corp
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Filing: 1994-09-14
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Granted: 1998-01-13
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Expires: 2014-09-14
Abstract
Abstract The present invention are dielectric black particles for use in electrophoretic images displays, electrostatic toner or the like, and the corresponding method of manufacturing the same. The present invention black particles are latex particles formed by a polymerization technique, wherein the latex particles are stained to a high degree of blackness with a metal oxide.
Inventors
- 👤 Wei-Hsin Hou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0806; C; C08; C08F; C08F8/00; C08F8/42; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167; G03G17/00; G03G17/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
An electrophoretic display having an electrophoretic dispersion positioned between an anode and a cathode, wherein said electrophoretic dispersion includes black dielectric electrophoretic particles suspended in a clear medium of a predetermined density, said electrophoretic particles being formed from a composite latex polymer having a core structure and at least one shell layer, said core structure having residual double bonds which have reacted with a metal oxide to produce said black color, said particles having a density substantially equal to said predetermined density of said liquid medium.
Claim 2
Dependent Claim
86 words
An electrophoretic display having an electrophoretic dispersion positioned between an anode and a cathode, wherein said electrophoretic dispersion includes black dielectric electrophoretic particles suspended in a clear medium of a predetermined density, said electrophoretic particles being formed from a composite latex polymer having a core structure and at least one shell layer, said core structure having residual double bonds which have reacted with a metal oxide to produce said black color, said particles having a density substantially equal to said predetermined density of said liquid medium.
Claim 3
Dependent Claim
25 words
The display according to claim 1, wherein said core structure and said at least one shell layer are formed by a seeded emulsion polymerization technique.
Claim 4
Dependent Claim
14 words
The display according to claim 2, wherein said core structure includes a poly(butadiene-co-styrene) polymer.
Claim 5
Dependent Claim
18 words
The display according to claim 3, wherein said at least one shell layer includes a poly(styrene-co-methacrylic acid) polymer.
Claim 6
Dependent Claim
14 words
The display according to claim 2, wherein said core structure includes a polystyrene polymer.
Claim 7
Dependent Claim
53 words
The display according to claim 5, wherein said at least one shell layer includes a first shell layer and a second shell layer, said first shell layer being composed of polybutadiene and surrounds said polystyrene core and said second shell layer being composed of a poly(styrene-co-methacrylic) polymer and surrounding said first shell layer.
Claim 8
Dependent Claim
13 words
The display according to claim 1, wherein said metal oxide includes osmium tetroxide.
Claim 9
Dependent Claim
13 words
The display according to claim 1, wherein said metal oxide includes ruthenium tetraoxide.
Claim 10
Dependent Claim
22 words
The display according to claim 1, wherein said at least one shell structure is poly(butadiene-co-methacrylic acid) and said core structure is poly(butadiene-co-styrene).
Claim 11
Dependent Claim
12 words
The display according to claim 1, wherein said electrophoretic particles are hollow.
Claim 12
Dependent Claim
22 words
The display according to claim 10 wherein said electrophoretic particles include a hollow region encapsulated by said at least one shell layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |