Patent US4265841A successfully refreshed from Google Patents.
US4265841A
Expired / Lapsed
US
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Method for production of composite piezoelectric material
Assignee: Toshiba Corp
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Filing: 1979-09-20
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Granted: 1981-05-05
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Expires: 1999-09-20
Abstract
Abstract Disclosed is a method of producing composite piezoelectric materials exhibiting a high flexibility and a high piezoelectric effect, comprising the steps of treating an inorganic dielectric material powder with a latex-containing dispersion so as to coat the surfaces of the powder particles with the rubber particles in a manner to provide encapsulated powder particles, kneading the encapsulated powder particles, shaping the kneaded mass, and polarizing the shaped mass.
Inventors
- 👤 Yoshinori Fujimori
- 👤 Akio Ishizawa
- 👤 Minoru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:38
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/852; H10N30/01; H10N30/04; H10N30/045; H10N30/09; H10N30/092
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A method of producing a composite piezoelectric material, comprising the steps of treating an inorganic dielectric material powder with a latex-containing dispersion so as to coat the surfaces of the powder particles with the rubber particles contained in the latex in a manner to provide encapsulated powder particles, kneading the encapsulated powder particles, shaping the kneaded mass, and polarizing the shaped mass.
Claim 2
Independent Claim
62 words
A method of producing a composite piezoelectric material, comprising the steps of treating an inorganic dielectric material powder with a latex-containing dispersion so as to coat the surfaces of the powder particles with the rubber particles contained in the latex in a manner to provide encapsulated powder particles, kneading the encapsulated powder particles, shaping the kneaded mass, and polarizing the shaped mass.
Claim 3
Dependent Claim
16 words
The method according to claim 1, wherein the latex-containing dispersion contains a radical polymerizable vinyl monomer.
Claim 4
Dependent Claim
15 words
The method according to claim 1, wherein the latex-containing dispersion contains a polar fluoropolymer dispersion.
Claim 5
Dependent Claim
27 words
The method according to claim 1, wherein the amount of the inorganic dielectric material powder ranges from 20 to 97% by weight of the composite piezoelectric material.
Claim 6
Dependent Claim
27 words
The method according to claim 1, wherein the amount of the inorganic dielectric material powder ranges from 80 to 96% by weight of the composite piezoelectric material.
Claim 7
Dependent Claim
57 words
The method according to claim 1, wherein the step of treating the inorganic dielectric material powder comprises adding the powder to the latex-containing dispersion, agitating the mixture, adding a coagulating agent to the mixture for coating the surfaces of the powder particles with the rubber particles, water-washing the rubber-coated powder particles, and drying the washed powder particles.
Claim 8
Dependent Claim
18 words
The method according to claim 1, 2 or 3, wherein the latex containing dispersion contains a vulcanizing agent.
Claim 9
Dependent Claim
15 words
The method according to claim 1, wherein roll calendering is employed in the shaping step.
Claim 10
Dependent Claim
34 words
The method according to claim 1, wherein the rubber contained in the latex is a synthetic rubber selected from the group consisting of acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, modified acrylic ester polymer and butadiene homopolymer.
Claim 11
Dependent Claim
18 words
The method according to claim 1, wherein the inorganic dielectric material powder is piezoelectric ceramics of perovskite structure.
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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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |