Patent US4767191A successfully refreshed from Google Patents.
US4767191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display cell
Assignee: US Philips Corp
•
Filing: 1987-04-13
•
Granted: 1988-08-30
•
Expires: 2007-04-13
Abstract
Abstract A display cell which contains a liquid crystalline compound having a tilted orientation and a tilt angle of 8°-50°, in which an orientation layer is used of a cyclo-aliphatic polyether.
Inventors
- 👤 Hendrik A. Van Sprang
- 👤 Henricus G. Koopman
- 👤 Franciscus J. M. Wortel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:52
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K2323/00; C09K2323/05; C09K2323/055
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A display cell comprising two closely-spaced parallel transparent substrate plates which are interconnected along their periphery by means of a seal, and which plates are provided with an electrode carrying an orientation layer on their facing surfaces, which orientation layer provides a tilted orientation to a liquid crystalline compound which is introduced into the space bounded by the plates and the seal, characterized in that the orientation layer is a polymer layer which essentially contains a cycloaliphatic polyether.
Claim 2
Dependent Claim
78 words
A display cell comprising two closely-spaced parallel transparent substrate plates which are interconnected along their periphery by means of a seal, and which plates are provided with an electrode carrying an orientation layer on their facing surfaces, which orientation layer provides a tilted orientation to a liquid crystalline compound which is introduced into the space bounded by the plates and the seal, characterized in that the orientation layer is a polymer layer which essentially contains a cycloaliphatic polyether.
Claim 3
Dependent Claim
33 words
A display cell as claimed in claim 1, characterized in that the orientation layer contains a copolymer of two or more monomers, at least two monomers of which are a cycloaliphatic ether compound.
Claim 4
Dependent Claim
22 words
A display cell as claimed in claim 2, characterized in that the mixture of monomers also contains a monomeric epoxy alkane compound.
Claim 5
Dependent Claim
21 words
A display cell as claimed in claim 1 characterized in that the orientation layer contains a polymer of an epoxycycloalkane compound.
Claim 6
Dependent Claim
23 words
A display cell as claimed in claim 4, characterized in that the orientation layer contains a copolymer of an epoxycycloalkane compound and tetrahydrofuran.
Claim 7
Dependent Claim
25 words
A display cell as claimed in claim 5, characterized in that the orientation layer contains a copolymer of an epoxycyclohexane, tetrahydrofuran and an ethylene oxide.
Claim 8
Dependent Claim
59 words
A display cell as claimed in claim 1, characterized in that the molecules of the liquid crystalline compound form a tilt angle of 15°-30° with the surface of the orientation layer which is formed of a polymer layer which contains a cyclo-aliphatic polyether, and in that the molecules between the substrate plates are rotated through an angle of 270°.
References Cited (Backward Citations)
DE1302652B
Cited
US4247658A
Cited
US4514043A
Cited
DE3138556A1
Cited
US4657832A
Cited
US4680195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |