US4325610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing agent for plastic liquid crystal display panels
Assignee: Ricoh Co Ltd
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Filing: 1980-09-30
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Granted: 1982-04-20
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Expires: 2000-09-30
Abstract
Abstract A sealing agent for plastic liquid crystal display panels which comprises the following three effective components: (a) Nylon and/or a linear saturated polyester; (b) an epoxy resin and/or an isocyanate compound; and (c) a solvent which can dissolve the components (a) and (b), and a transparent plastic panel substrate. The sealing agent makes it possible to use a transparent plastic film as a substrate for a liquid crystal display panel, thereby enabling inexpensive mass-production of high quality liquid crystal display panels.
Inventors
- 👤 Hiroshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:35
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4028; C09; C09J; C09J163/00; C09J167/00; C09J167/02; C09J177/00; C08L; C08L2666/00; C08L2666/02; C08L2666/14; G02F1/133305; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A method of sealing a liquid crystal display panel comprising: applying sealant to at least one of separated upper and lower transparent plastic panel substrates, drying said sealant to effect preliminary solidification of said sealant, depositing a liquid crystal within one of the panel substrates, hot press sealing the two panel substrates and curing the sealed portion at a temperature above the melting point of the plastic substrates but below the thermal deformation temperature of the substrates.
Claim 2
Independent Claim
77 words
A method of sealing a liquid crystal display panel comprising: applying sealant to at least one of separated upper and lower transparent plastic panel substrates, drying said sealant to effect preliminary solidification of said sealant, depositing a liquid crystal within one of the panel substrates, hot press sealing the two panel substrates and curing the sealed portion at a temperature above the melting point of the plastic substrates but below the thermal deformation temperature of the substrates.
Claim 3
Dependent Claim
57 words
The sealing method of claim 1, wherein the sealant for the plastic liquid crystal display panels comprises the following three components: (a) nylon and/or a linear saturated polyester; (b) an epoxy resin and/or an isocyanate compound; and (c) a solvent which can dissolve the components (a) and (b), and can also dissolve said transparent plastic panel substrates.
Claim 4
Dependent Claim
12 words
The sealing method of claim 2, wherein said component (c) comprises 1,1,1,3,3,3-hexafluoro-2-propanol.
Claim 5
Dependent Claim
23 words
The sealing method of claim 2, wherein said nylon and linear saturated polyester have a melting point of 60° C. to 150° C.
Claim 6
Dependent Claim
18 words
The sealing method of claim 2, wherein said epoxy resin has a molecular weight of 130 to 1,260.
Claim 7
Dependent Claim
22 words
The sealing method of claim 2, wherein said components (a) and (b) have the following ratio: Component (a): component (b)=2.5 to 3:1.
References Cited (Backward Citations)
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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) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |