US4874727A
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Particulate lead titanate ceramic and composite material containing same
Assignee: Niterra Co Ltd
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Filing: 1987-08-20
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Granted: 1989-10-17
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Expires: 2007-08-20
Abstract
Abstract A particulate lead titanate ceramic obtained by calcining a mixture containing TiO 2 and PbO at 1150°-1300° C., the proportion of the PbO being greater than 1 mole per mole of the TiO 2 . A composite material having the particulate lead titanate ceramic supported in an organic substrate exhibits improved piezoelectric properties and is useful as a piezoelectric element or pyroelectric element.
Inventors
- 👤 Kanji Ohya
- 👤 Tsutomu Tsunooka
- 👤 Koji Ogura
- 👤 Hirofumi Ozeki
- 👤 Takashi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; H; H10; H10N; H10N15/00; H10N15/10; H10N15/15; H10N30/00; H10N30/80; H10N30/85; H10N30/853; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
27 words
A dielectric particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08.
Claim 2
Dependent Claim
27 words
A dielectric particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08.
Claim 3
Dependent Claim
17 words
A dielectric composition according to claim 1, wherein said particles are larger than 14 μm in size.
Claim 4
Dependent Claim
19 words
A dielectric composition according to claim 2, wherein said particles are about 14 to about 1000 μm in size.
Claim 5
Dependent Claim
19 words
A dielectric composition according to claim 3, wherein said particles are about 14 to about 88 μm in size.
Claim 6
Dependent Claim
22 words
A dielectric composition according to claim 1, wherein said particles have an x-ray diffraction pattern with more than 0.34 degrees of orientation.
Claim 7
Dependent Claim
24 words
A dielectric composition according to claim 1, wherein said particles have an x-ray diffraction pattern with about 0.34 to about 0.76 degrees of orientation.
Claim 8
Dependent Claim
37 words
A dielectric composition according to claim 5, wherein said particles are about 14 to about 88 μm in size, and wherein said particles have an x-ray diffraction pattern with about 0.52 to about 76.0 degrees of orientation.
Claim 9
Dependent Claim
44 words
A dielectric composition according to claim 1, wherein said particles are obtained by calcining a mixture of PbO and TiO 2 having 1.01 to 1.08 moles of PbO for each mole of TiO 2 at a temperature of from 1150 to 1300 degrees C.
Claim 10
Dependent Claim
44 words
A dielectric composition according to claim 4, wherein said particles are obtained by calcining a mixture of PbO and TiO 2 having 1.01 to 1.08 moles of PbO for each mole of TiO 2 at a temperature of from 1150 to 1300 degrees C.
Claim 11
Dependent Claim
44 words
A dielectric composition according to claim 6, wherein said particles are obtained by calcining a mixture of PbO and TiO 2 having 1.01 to 1.08 moles of PbO for each mole of TiO 2 at a temperature of from 1150 to 1300 degrees C.
Claim 12
Dependent Claim
44 words
A dielectric composition according to claim 7, wherein sid particles are obtained by calcining a mixture of PbO and TiO 2 having 1.01 to 1.08 moles of PbO for each mole of TiO 2 at a temperature of from 1150 to 1300 degrees C.
Claim 13
Dependent Claim
56 words
A particulate lead composite material comprising an organic matrix, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are substantially homogeneously dispersed in said matrix and are uniformly aligned in substantially the same direction.
Claim 14
Dependent Claim
56 words
A particulate lead composite material comprising an organic matrix, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are substantially homogeneously dispersed in said matrix and are uniformly aligned in substantially the same direction.
Claim 15
Dependent Claim
22 words
A composite material according to claim 12, wherein said direction is the same as the direction of spontaneous polarization of said particles.
Claim 16
Dependent Claim
24 words
A composite material according to claim 13, wherein said organic matrix is an epoxy resin comprising about 40% of the composite material by volume.
Claim 17
Dependent Claim
29 words
A composite material according to claim 12, wherein said composite is in the form of a flat sheet and said direction is parallel to the plane of said sheet.
Claim 18
Dependent Claim
70 words
A particulate lead composite material comprising an organic matrix in the form of a flat sheet and having one or more openings therein, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are disposed within said one or more openings and are aligned in substantially the same direction.
Claim 19
Dependent Claim
70 words
A particulate lead composite material comprising an organic matrix in the form of a flat sheet and having one or more openings therein, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are disposed within said one or more openings and are aligned in substantially the same direction.
Claim 20
Dependent Claim
64 words
A particulate lead composite material comprising an organic matrix, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are substantially homogeneously dispersed on and bonded to at least one surface of said matrix and are uniformly aligned in substantially the same direction.
Claim 21
Dependent Claim
64 words
A particulate lead composite material comprising an organic matrix, and a particulate lead ceramic composition consisting essentially of rectangular parallelepiped particles having the formula Pb 1+x TiO 3+x , wherein x is from 0.01 to 0.08, and wherein said particles are substantially homogeneously dispersed on and bonded to at least one surface of said matrix and are uniformly aligned in substantially the same direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |