Patent US4983023A successfully refreshed from Google Patents.
US4983023A
Expired / Lapsed
US
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Liquid crystal display panel with polymer spacers containing a percentage of epoxy groups
Assignee: Kitazawa Yakuhin Co Ltd
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Filing: 1988-10-06
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Granted: 1991-01-08
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Expires: 2008-10-06
Abstract
Abstract A liquid crystal display panel comprises at least two base plates spaced by a sealant on the peripheral portion of the plates and liquid crystal in the space between the base plates. The liquid crystal contains a spacer of rigid particles and polymer particles having 10 to 30% by weight of an epoxy group.
Inventors
- 👤 Kenichi Nakagawa
- 👤 Takeshi Kitazawa
- 👤 Takashi Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A liquid crystal display panel comprising at least two base plates spaced by a sealant on the peripheral portion of the plates and liquid crystal in the space between the base plates, wherein said liquid crystal contains as a spacer rigid particles and polymer particles having 10 to 30% by weight of an epoxy group.
Claim 2
Dependent Claim
55 words
A liquid crystal display panel comprising at least two base plates spaced by a sealant on the peripheral portion of the plates and liquid crystal in the space between the base plates, wherein said liquid crystal contains as a spacer rigid particles and polymer particles having 10 to 30% by weight of an epoxy group.
Claim 3
Dependent Claim
23 words
The liquid crystal display panel according to claim 1 wherein said rigid particles are one of glass fiber, plastic particles and inorganic particles.
Claim 4
Dependent Claim
23 words
The liquid crystal display panel according to claim 1 wherein said polymer particles are acrylic polymer particles which are treated with polyglycidyl ether.
Claim 5
Dependent Claim
22 words
The liquid crystal display panel according to claim 1 wherein said polymer particles are prepared by polymerizing an epoxy group-containing vinyl monomer.
Claim 6
Dependent Claim
38 words
The liquid crystal display panel according to claim 1 wherein said base plates have a film formed thereon and wherein said epoxy groups of the polymer particles react with the film and base plates to chemically bond thereto.
Claim 7
Dependent Claim
33 words
The liquid crystal display panel according to claim 1 wherein said polymer particles are selected from the group consisting of acrylic crosslinked particles, styrene crosslinked particles, ester crosslinked particles, and urethane crosslinked particles.
Claim 8
Dependent Claim
25 words
The liquid crystal display panel according to claim 1 wherein the epoxy group is introduced by treating the polymer particles with epihalohydrine or polyglycidyl ether.
Claim 9
Dependent Claim
23 words
The liquid crystal display panel according to claim 1 wherein the polymer particles contain 20 to 30% by weight of an epoxy group.
Claim 10
Dependent Claim
23 words
The liquid crystal display panel according to claim 1 wherein the polymer particles contain 28 to 29% by weight of an epoxy group.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |