Patent US5043622A successfully refreshed from Google Patents.
US5043622A
Expired / Lapsed
US
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Easily poled 0-3 piezoelectric composites for transducer applications
Assignee: CNA Holdings LLC
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Filing: 1990-06-01
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Granted: 1991-08-27
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Expires: 2010-06-01
Abstract
Abstract A PET-polymer composite of 0-3 connectivity further includes a third phase particulate additive of conductive or semiconductive material to increase the electrical conductivity of the polymer matrix.
Inventors
- 👤 Geon Sagong
- 👤 Ahmad Safari
- 👤 Sei-Joo Jang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:32
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/852; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A transducer comprising a poled piezoelectric-polymer composite material of 0-3 connectivity and which comprises: a matrix of insulating polymer, a piezoelectric ceramic powder dispersed within said polymer matrix and an inorganic conductive or semiconductive particulate additive dispersed within said polymer matrix, said inorganic additive having an electrical conductivity greater than the electrical conductivity of said insulating polymer matrix.
Claim 2
Dependent Claim
58 words
A transducer comprising a poled piezoelectric-polymer composite material of 0-3 connectivity and which comprises: a matrix of insulating polymer, a piezoelectric ceramic powder dispersed within said polymer matrix and an inorganic conductive or semiconductive particulate additive dispersed within said polymer matrix, said inorganic additive having an electrical conductivity greater than the electrical conductivity of said insulating polymer matrix.
Claim 3
Dependent Claim
24 words
The transducer of claim 1 wherein the said particulate additive in said composite comprises about 1.5 to about 4 volume % of said composite.
Claim 4
Dependent Claim
24 words
The transducer of claim 1 wherein said particulate additive has an electrical conductivity of at least about 10 -3 ohm -1 cm -1 .
Claim 5
Dependent Claim
14 words
The transducer of claim 1 wherein said particulate additive comprises is a conductive metal.
Claim 6
Dependent Claim
13 words
The transducer of claim 1 wherein said particulate additive is a semiconductive material.
Claim 7
Dependent Claim
11 words
The transducer of claim 5 wherein said semiconductive material is carbon.
Claim 8
Dependent Claim
11 words
The transducer of claim 5 wherein said semiconductive material is germanium.
Claim 9
Dependent Claim
11 words
The transducer of claim 5 wherein said semiconductive material is silicon.
Claim 10
Dependent Claim
24 words
The transducer of claim 1 wherein said piezoelectric ceramic powder comprises at least about 60 vol. % of said ceramic powder and polymer mixture.
Claim 11
Dependent Claim
13 words
The transducer of claim 1 wherein said insulating polymer is an epoxy resin.
Claim 12
Dependent Claim
14 words
The transducer of claim 1 wherein said piezoelectric ceramic powder is lead zirconate titanate.
References Cited (Backward Citations)
JPS61219188A
Cited
JPS61283181A
Cited
EP0208019A2
Cited
EP0247734A2
Cited
US4726099A
Cited
US4933230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |