Patent US5359253A successfully refreshed from Google Patents.
US5359253A
Expired / Lapsed
US
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Piezoelectric material comprising a polymer network
Assignee: US Philips Corp
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Filing: 1993-03-25
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Granted: 1994-10-25
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Expires: 2013-03-25
Abstract
Abstract The invention relates to a piezoelectric element comprising a piezoelectric material 1, in the form of a polymer network, between at least two electrodes 2, 3. The piezoelectric material is formed from a starting material comprising a liquid crystalline monomeric material and a chiral compound. The starting material is brought to a temperature at which a smectic phase is formed, and an electric field is applied to obtain a dipolar orientation in the starting material, after which the polymer network is formed by means of photopolymerisation. The piezoelectric element thus manufactured can suitably be used for various electromechanical applications, as a sensor material, for pyroelectric applications and, in particular, also for optical applications.
Inventors
- 👤 Rifat A. M. Hikmet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:05
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/52; C09K19/58; C09K19/586; H10N30/01; H10N30/09; H10N30/098; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
A piezoelectric material comprising a chiral compound and an anisotropic polymer network having a smectic structure, characterized in that the piezoelectric material has permanently oriented dipoles.
Claim 2
Dependent Claim
26 words
A piezoelectric material comprising a chiral compound and an anisotropic polymer network having a smectic structure, characterized in that the piezoelectric material has permanently oriented dipoles.
Claim 3
Dependent Claim
27 words
A piezoelectric material as claimed in claim 1, characterized in that the polymer network consists of poly(meth)acrylate chains having mesogenic groups in the crosslinks of the network.
Claim 4
Dependent Claim
38 words
A piezoelectric element having a piezoelectric material between at least two electrodes, said piezoelectric material comprising a chiral compound and an anisotropic polymer network having a smectic structure, characterized in that the polymer network has permanently oriented dipoles.
Claim 5
Dependent Claim
38 words
A piezoelectric element having a piezoelectric material between at least two electrodes, said piezoelectric material comprising a chiral compound and an anisotropic polymer network having a smectic structure, characterized in that the polymer network has permanently oriented dipoles.
Claim 6
Independent Claim
69 words
A method of manufacturing a piezoelectric material by forming an anisotropic polymer network from a starting material comprising a liquid crystalline monomeric material and a chiral compound, characterized in that the starting material is brought to a temperature at which a smectic phase is formed, and an electric field is applied to obtain a dipolar orientation in the starting material, after which the polymer network is formed by photopolymerisation.
Claim 7
Independent Claim
69 words
A method of manufacturing a piezoelectric material by forming an anisotropic polymer network from a starting material comprising a liquid crystalline monomeric material and a chiral compound, characterized in that the starting material is brought to a temperature at which a smectic phase is formed, and an electric field is applied to obtain a dipolar orientation in the starting material, after which the polymer network is formed by photopolymerisation.
Claim 8
Dependent Claim
17 words
A method as claimed in claim 4, characterized in that the monomeric material is a di(meth)acrylate compound.
References Cited (Backward Citations)
US4877988A
Cited
EP0261712A1
Cited
US4875378A
Cited
EP0293911A2
Cited
US4933479A
Cited
JPH01113728A
Cited
JPH01296216A
Cited
US5187402A
Cited
US5105116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |