Patent US722983A successfully refreshed from Google Patents.
Patent EP0234751A2 successfully refreshed from Google Patents.
EP0234751A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Non-linear optical device
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1987-01-28
•
Granted: —
•
Expires: 2007-01-28
Abstract
Abstract Optical elements comprising a non-centrosymmetric compound comprising an electron donor and an electron acceptor linked by a conjugated bridging group, in which the electron acceptor is a nitroso groups, in which element the molecules of the compound are aligned so that the element has a net non-centrosymmetry, a method for their preparation, optical devices comprising such elements, and some of the compounds.
Inventors
- 👤 Simon Allen
- 👤 Paul Francis Gordon
- 👤 John Oswald Morley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3613; G02F1/3611; G02F1/3612
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
An optical element comprising a non-centrosymmetric compound comprising an electron donor and an electron acceptor linked by a conjugated bridging group, in which the electron acceptor is a nitroso group, in which element the molecules of the compound are aligned so that the element has a net non-centrosymmetry.
Claim 2
Dependent Claim
48 words
An optical element comprising a non-centrosymmetric compound comprising an electron donor and an electron acceptor linked by a conjugated bridging group, in which the electron acceptor is a nitroso group, in which element the molecules of the compound are aligned so that the element has a net non-centrosymmetry.
Claim 3
Dependent Claim
124 words
An optical element according to claim 1 wherein the compound is of the formula: D-B-N=O I in which B is a bridging group having an electron pathway provided by a conjugated system of single and double bonds between D and the nitroso group (-N=O); and D is an electron donor of the formula -(L)₁-(Dʹ) m II wherein L is a benzene or naphthalene nucleus or conjugated alkylene or alkapolyene chain; Dʹ is selected from -OT, -ST, -NTV, PTV in which T and V each independently represents H, alkyl, alkenyl, aryl or heteroaryl, or T & V together with the N atom to which they are attached represent morpholino, piperazino, piperidino or pyridino; l is 0 or 1; and m is 1, 2 or 3.
Claim 4
Dependent Claim
25 words
An optical element according to claim 2 wherein B is selected from arylene, azo and groups containing azo, imine and groups containing imine, and alk(poly)enylene.
Claim 5
Dependent Claim
53 words
An optical element according to claim 1 comprising a single crystal of a compound of formula I which contains one or more chiral atoms, or a chemically inert liquid crystal material containing a compound of formula I which is aligned as defined in claim 1 by the application of a d.c. electric field.
Claim 6
Dependent Claim
23 words
An optical element according to claim 1 wherein the element comprises a thin film of the compound of formula I on a substrate.
Claim 7
Dependent Claim
38 words
An optical element according to claim 5 wherein the element comprises at least two monolayers of the compound of formula I in each of which monolayers the molecules of the compound are aligned as defined in claim 1.
Claim 8
Dependent Claim
39 words
An optical element according to claim 6 wherein all the molecules of the compound of formula I are aligned such that the vectors along the axis of polarisation in the molecules are substantially parallel and in the same sense.
Claim 9
Dependent Claim
45 words
A method for the preparation of an optical element according to claim 6 which comprises passing a surface of a transparent or reflecting substrate into and out of a Langmuir trough containing a liquid carrying a superficial monomolecular layer of a compound of formula I.
Claim 10
Dependent Claim
12 words
An optical device comprising a non-linear optical element according to claim 5.
Claim 11
Dependent Claim
11 words
10 A compound of formula I as defined in claim 2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.