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Patent US3881806A successfully refreshed from Google Patents.
US3881806A
Expired / Lapsed
US
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Electro-optical display device
Assignee: Suwa Seikosha KK
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Filing: 1973-07-13
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Granted: 1975-05-06
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Expires: 1993-07-13
Abstract
Abstract An electro-optical display device utilizes a new type of nematic liquid crystal which in the absence of an electric field rotates the plane of polarized light whereas in the presence of an electric field the compound permits polarized light to travel therethrough with the plane of polarization unaltered. The compounds utilized have a nitrile group therein as a result of which the dipole moment of the molecule coincides with the axis of the molecule so that the material has a positive dielectric anisotropy. The device may be used for displaying time in a watch.
Inventors
- 👤 Toshihiro Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
IN AN ELECTRO-OPTICAL DISPLAY DEVICE, THE COMBINATION COMPRISING A LIQUID CRYSAL COMPOSITION INCLUDING AT LEAST ONE COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
20 words
IN AN ELECTRO-OPTICAL DISPLAY DEVICE, THE COMBINATION COMPRISING A LIQUID CRYSAL COMPOSITION INCLUDING AT LEAST ONE COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
42 words
The combination as defined in claim 1 wherein the concentration of said compound in said composition and the thickness of said layer of said composition are such that light passing therethrough in the absence of an electric field is rotated through 90*.
Claim 4
Dependent Claim
38 words
The combination as defined in claim 2, wherein the axes of said polarizing plates are parallel to each other so that an electric field must be imposed across said layer for light to be transmitted through said device.
Claim 5
Dependent Claim
41 words
The combination as defined in claim 2, wherein the axes of said polarizing plates are perpendicular to each other so that an electric field must be impressed across said thin layer in order to prevent transmission of light through said device.
Claim 6
Dependent Claim
19 words
The device as defined in claim 1 wherein said composition contains from 5 to 50 percent of said compound.
Claim 7
Dependent Claim
29 words
The device as defined in claim 1 wherein said composition consists essentially of nematic liquid crystal compounds having a liquid crystal phase within the range of 0*C to 73*C.
Claim 8
Dependent Claim
26 words
The device as defined in claim 1 wherein said composition consists essentially of 20 percent 4-n-butylphenyl-4'' cyanobenzoate, 40 percent of 4-methoxybenzylidyne-4''-n-butylaniline, and 40 percent of 4-ethoxybenzylidyne-4''-n-butylaniline.
Claim 9
Dependent Claim
33 words
The device as defined in claim 1 wherein said composition consists essentially of 20 percent 4-n-butylpHenyl-4'' cyanobenzoate, 30 percent of p-(p''-methoxyphenylazo) phenylbutane, 30 percent of p-(p''-ethylphenylazo) phenylhexanoate, and 20 percent of p-(p''-n-propylphenylazo) phenylheptanoate.
Claim 10
Dependent Claim
72 words
A wrist-watch including the electro-optical device as defined in claim 1, wherein one of said transparent coatings is divided into segments disposed for displaying any number from zero to nine and selectively connectable to a voltage source for destroying the optical rotatory power of liquid crystals of positive dielectric anisotropy between said selectively connectable segments and the opposed transparent conductive coating, the axes of said polarizing plates being perpendicular to each other.
References Cited (Backward Citations)
US3731986A
Cited
US3795436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |