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US5320910A
Expired / Lapsed
US
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Piezoelectric composite material
Assignee: Niterra Co Ltd
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Filing: 1992-12-04
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Granted: 1994-06-14
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Expires: 2012-12-04
Abstract
Abstract A piezoelectric composite material including an organic matrix, and 72-78 % by volume of a piezoelectric ceramic powder dispersed in the matrix and consisting of 25-41.6 % by weight of a first group of lead titanate particles having a first average particle size, 25-41.6 % by weight of a second group of lead titanate particles having a second average particle size and 25-41.6 % by weight of a third group of lead titanate particles having a third average particle size. The first, second and third average particle sizes are different from each other and generally 2.5-4.5 μm, 5-10 μm and 20-40 μm, respectively. At least a portion of the lead titanate particles of one of the first to third groups may be substituted with lead titanate zirconate having a similar particle size.
Inventors
- 👤 Hisao Banno
- 👤 Kohji Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/852; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12146
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A piezoelectric composite material comprising an organic matrix, and a piezoelectric ceramic powder dispersed in said matrix and consisting of 25-41.6% by weight of a first group of lead titanate particles having a first average particle size, 25-41% by weight of a second group of lead titanate particles having a second average particle size and 25-41.6% by weight of a third group of lead titanate particles having a third average particle size, said first, second and third average particle sizes being different from each other and said piezoelectric ceramic powder being present in an amount of 72-78% based on the total volume of said piezoelectric ceramic powder and said organic matrix.
Claim 2
Dependent Claim
111 words
A piezoelectric composite material comprising an organic matrix, and a piezoelectric ceramic powder dispersed in said matrix and consisting of 25-41.6% by weight of a first group of lead titanate particles having a first average particle size, 25-41% by weight of a second group of lead titanate particles having a second average particle size and 25-41.6% by weight of a third group of lead titanate particles having a third average particle size, said first, second and third average particle sizes being different from each other and said piezoelectric ceramic powder being present in an amount of 72-78% based on the total volume of said piezoelectric ceramic powder and said organic matrix.
Claim 3
Dependent Claim
27 words
A piezoelectric composite material as claimed in claim 1, wherein said first, second and third average particle sizes are 2.5-4.5 μm, 5-10 μm and 20-40 μm, respectively.
Claim 4
Dependent Claim
23 words
A piezoelectric composite material as claimed in claim 1, wherein said first, second and third groups are present in substantially the same amount.
Claim 5
Dependent Claim
35 words
A piezoelectric composite material as claimed in claim 1, wherein said piezoelectric ceramic powder is present in an amount of 74-76% based on the total volume of said piezoelectric ceramic powder and said organic matrix.
Claim 6
Dependent Claim
151 words
A piezoelectric composite material comprising an organic matrix, and a piezoelectric ceramic powder dispersed in said matrix and consisting of 25-41.6% by weight of a first group of particles of lead titanate having a first average particle size, 25-41.6% by weight of a second group of particles of lead titanate zirconate or a mixture of lead titanate zirconate with lead titanate having a second average particle size and 25-41.6% by weight of a third group of particles of lead titanate having a third average particle size, said first, second and third average particle sizes being different from each other and said piezoelectric ceramic powder being present in an amount of 72-78% based on the total volume of said piezoelectric ceramic powder and said organic matrix, said composite material having been prepoled by application of a high voltage and thereafter subjected to reverse poling so that d 31 thereof is substantially zero.
Claim 7
Dependent Claim
151 words
A piezoelectric composite material comprising an organic matrix, and a piezoelectric ceramic powder dispersed in said matrix and consisting of 25-41.6% by weight of a first group of particles of lead titanate having a first average particle size, 25-41.6% by weight of a second group of particles of lead titanate zirconate or a mixture of lead titanate zirconate with lead titanate having a second average particle size and 25-41.6% by weight of a third group of particles of lead titanate having a third average particle size, said first, second and third average particle sizes being different from each other and said piezoelectric ceramic powder being present in an amount of 72-78% based on the total volume of said piezoelectric ceramic powder and said organic matrix, said composite material having been prepoled by application of a high voltage and thereafter subjected to reverse poling so that d 31 thereof is substantially zero.
Claim 8
Dependent Claim
27 words
A piezoelectric composite material as claimed in claim 5, wherein said first, second and third average particle sizes are 2.5-4.5 μm, 5-10 μm and 20-40 μm, respectively.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |