Patent US4820025A successfully refreshed from Google Patents.
US4820025A
Expired / Lapsed
US
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Liquid crystal cell
Assignee: Alps Alpine Co Ltd
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Filing: 1987-01-12
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Granted: 1989-04-11
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Expires: 2007-01-12
Abstract
Abstract A pair of substrates are opposed to each other and the peripheral portions thereof are sealed by a sealing member. A part of the sealing member is opened so as to constitute a liquid crystal injection hole. A groove for introducing a liquid crystal is provided on the inner surface of at least one of the substrates in such a manner as to lead from the injection hole to the inner surface of the cell.
Inventors
- 👤 Jun Nakanowatari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1341
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
In a liquid crystal cell having a pair of opposed substrates, a sealing member for sealing and joining peripheral portions of said substrates so as to form an enclosed interior space defined by said sealing member and opposed inner surfaces of said substrates, and an injection hole formed by an opening in a part of said sealing member for injecting a liquid crystal into said interior space under vacuum pressure, the improvement comprising: a groove formed in the inner surface of one of said substrates leading from said injection hole into said interior space, which facilitates rapid injection of said liquid crystal into said interior space, wherein said groove has a width of 300 μm and a depth of 200 μm and a length extending along a corresponding length of one peripheral portion of said substrates.
Claim 2
Dependent Claim
136 words
In a liquid crystal cell having a pair of opposed substrates, a sealing member for sealing and joining peripheral portions of said substrates so as to form an enclosed interior space defined by said sealing member and opposed inner surfaces of said substrates, and an injection hole formed by an opening in a part of said sealing member for injecting a liquid crystal into said interior space under vacuum pressure, the improvement comprising: a groove formed in the inner surface of one of said substrates leading from said injection hole into said interior space, which facilitates rapid injection of said liquid crystal into said interior space, wherein said groove has a width of 300 μm and a depth of 200 μm and a length extending along a corresponding length of one peripheral portion of said substrates.
Claim 3
Dependent Claim
58 words
A liquid crystal cell according to claim 1, wherein said peripheral portions of said substrates are mutually perpendicular to each other, said injection hole is formed in one corner defined by two adjacent perpendicular peripheral portions, and said groove includes two groove portions each having a length extending along a respective one of said two adjacent peripheral portions.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |