Patent US3982820A successfully refreshed from Google Patents.
US3982820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device
Assignee: Panasonic Holdings Corp
•
Filing: 1975-08-26
•
Granted: 1976-09-28
•
Expires: 1995-08-26
Abstract
Abstract A liquid crystal display device comprising a pair of transparent substrates each provided with a transparent conductive film on the interior surface, boron nitride coating layers disposed on inner surfaces of the substrates and the conductive films, and a liquid crystal material interposed between the coating layers, the boron nitride layer being given preferred directions for aligning the molecules of the liquid crystal material. This structure increases the chemical stability and improves the alignment of the molecules of the liquid crystal material to a great extent.
Inventors
- 👤 Katsuji Hattori
- 👤 Masakazu Fukai
- 👤 Akio Moriyama
- 👤 Yasuhiro Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; C; C09; C09K; C09K2323/00; C09K2323/05; C09K2323/051; C09K2323/053
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
A liquid crystal display device comprising a pair of transparent substrates, transparent conductive films formed on inner surfaces of the substrates, coating layers of boron nitride with hexagonal crystal structure, formed on inner surfaces of said substrates and said conductive films, and a liquid crystal material interposed between said coating layers.
Claim 2
Dependent Claim
51 words
A liquid crystal display device comprising a pair of transparent substrates, transparent conductive films formed on inner surfaces of the substrates, coating layers of boron nitride with hexagonal crystal structure, formed on inner surfaces of said substrates and said conductive films, and a liquid crystal material interposed between said coating layers.
Claim 3
Dependent Claim
27 words
A liquid crystal display device according to claim 1, further comprising an insulation film intervening between said substrate or said conductive film and said boron nitride layer.
Claim 4
Dependent Claim
19 words
A liquid crystal display device according to claim 2, in which said insulation film is formed of silicon dioxide.
Claim 5
Dependent Claim
38 words
A liquid crystal display device according to claim 2, in which said insulation film is formed of a material selected from the group consisting of pyrex glass, silicon monooxide, magnesium difluoride, cesium dioxide, titanium oxide and yttrium oxide.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |