Patent US4759820A successfully refreshed from Google Patents.
US4759820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a polymer matrix containing non-centrosymmetric crystals
Assignee: BP PLC
•
Filing: 1987-05-19
•
Granted: 1988-07-26
•
Expires: 2007-05-19
Abstract
Abstract A polymer matrix has grown therein in vitro and in situ non-centrosymmetric crystals of organic or inorganic compounds. The crystals are preferably orientated and may be used in electro-optical systems.
Inventors
- 👤 Paul D. Calvert
- 👤 Raymond M. Ellul
- 👤 Brian D. Moyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K3/00; C08K3/01; C08K5/16; C08K5/32; G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3615; Y; Y10; Y10S; Y10S117/00; Y10S117/903; Y10S117/904; Y10S117/918; Y10S117/919; Y10S359/00; Y10S359/90; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A process for producing a polymer matrix having grown therein in situ oriented, non-centrosymmetric crystals of organic or inorganic compounds, said process comprising dissolving the compound to be crystallised and the matrix polymer in a common solvent, then casting the solution into the desired shape on a substrate thereby allowing the compound to crystallise in situ in the matrix upon gradual evaporation of the solvent and finally subjecting the composite so formed to orientation.
Claim 2
Dependent Claim
74 words
A process for producing a polymer matrix having grown therein in situ oriented, non-centrosymmetric crystals of organic or inorganic compounds, said process comprising dissolving the compound to be crystallised and the matrix polymer in a common solvent, then casting the solution into the desired shape on a substrate thereby allowing the compound to crystallise in situ in the matrix upon gradual evaporation of the solvent and finally subjecting the composite so formed to orientation.
Claim 3
Dependent Claim
124 words
A process for producing a polymer matrix having grown therein in situ oriented, non-centrosymmetric crystals of organic or inorganic compounds, said process comprising dissolving a first compound and the matrix polymer in a common solvent, casting the solution into the desired shape on a substrate thereby allowing the first compound to crystallise in situ in the matrix, dipping the shape so formed into a solution of a second compound, which is also capable of forming non-centrosymmetric crystals thereby allowing crystals of said second compound to be formed in situ in the matrix polymer either by a reaction between the first and second compounds or by the displacement of the first compound by the second compound and finally subjecting the composite so formed to orientation.
Claim 4
Dependent Claim
124 words
A process for producing a polymer matrix having grown therein in situ oriented, non-centrosymmetric crystals of organic or inorganic compounds, said process comprising dissolving a first compound and the matrix polymer in a common solvent, casting the solution into the desired shape on a substrate thereby allowing the first compound to crystallise in situ in the matrix, dipping the shape so formed into a solution of a second compound, which is also capable of forming non-centrosymmetric crystals thereby allowing crystals of said second compound to be formed in situ in the matrix polymer either by a reaction between the first and second compounds or by the displacement of the first compound by the second compound and finally subjecting the composite so formed to orientation.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein the crystals of the organic or inorganic compounds formed in situ are oriented in such a manner that all the crystals are substantially in parallel alignment.
Claim 6
Dependent Claim
77 words
A process according to claim 3 wherein the orientation of the crystals is achieved by (a) stretching the composite during cooling after formation thereof, or (b) cold-drawing the formed composite, (c) subjecting the formed composite to an appropriate electrical field optionally accompanied by or preceded by drawing, (d) crystallisation of the composite in a stationary or mobile temperature gradient, or (e) swelling oriented matrix polymers with a solution of the compound which is then allowed to crystallise.
Claim 7
Dependent Claim
33 words
A process according to claim 2 wherein the crystals of the organic or inorganic compounds formed in situ are oriented in such a manner that all the crystals are substantially in parallel alignment.
References Cited (Backward Citations)
US3764807A
Cited
US4175152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |