US4400642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric composite materials
Assignee: United States, AERONAUTICS AD SPACE ADMINISTRATION, Administrator of
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Filing: 1982-07-12
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Granted: 1983-08-23
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Expires: 2002-07-12
Abstract
Abstract A laminated structural device has the ability to change shape, position and resonant frequency without using discrete motive components. The laminate (10) may be a combination of layers (14,16) of a piezoelectrically active, non-conductive matrix material as shown in FIG. 1. A power source (22) selectively places various levels of charge an electrically conductive filaments (18,20) imbedded in the respective layers to produce various configurations shown in FIGS. 2 to 5 in a predetermined manner. The layers may be electrically conductive having imbedded piezoelectrically active filaments. A combination of layers of electrically conductive material may be laminated to layers of piezoelectrically active material.
Inventors
- 👤 Louis J. Kiraly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0603; H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/80; H10N30/87; H10N30/875; H04; H04R; H04R17/00; H04R17/04; H04R17/08; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A laminated structural device having the ability to change shape, position and resonant frequency without using discrete motive components comprising piezoelectrically active composites laminated together, each of said piezoelectrically active composites containing at least one electrically conductive member, and means for selectively placing a predetermined level of charge in said electrically conductive member thereby inducing a distortion in each of said piezoelectrically active composites whereby the device is deformed in a controlled manner.
Claim 2
Dependent Claim
73 words
A laminated structural device having the ability to change shape, position and resonant frequency without using discrete motive components comprising piezoelectrically active composites laminated together, each of said piezoelectrically active composites containing at least one electrically conductive member, and means for selectively placing a predetermined level of charge in said electrically conductive member thereby inducing a distortion in each of said piezoelectrically active composites whereby the device is deformed in a controlled manner.
Claim 3
Dependent Claim
55 words
A device as claimed in claim 1 including a first layer of piezoelectrically active matrix material, a second layer of piezoelectrically active matrix material laminated to said first layer, a plurality of electrically conductive filaments imbedded in each of said layers, and said means places a predetermined level of charge in each of said filaments.
Claim 4
Dependent Claim
21 words
A device as claimed in claim 2 wherein the piezoelectrically active matrix material of each of said layers is lithium niobate.
Claim 5
Dependent Claim
18 words
A device as claimed in claim 2 wherein the filaments are substantially parallel in each of said layers.
Claim 6
Dependent Claim
72 words
A laminated structural device having the ability to change shape, position and resonant frequency without using discrete motive components comprising electrically conductive composites laminated together, each of said electrically conductive composites containing at least one piezoelectrically active member, and means for selectively placing a predetermined level of charge in said electrically conductive composites thereby inducing distortion in each of said piezoelectrically active members whereby the device is deformed in a controlled manner.
Claim 7
Dependent Claim
72 words
A laminated structural device having the ability to change shape, position and resonant frequency without using discrete motive components comprising electrically conductive composites laminated together, each of said electrically conductive composites containing at least one piezoelectrically active member, and means for selectively placing a predetermined level of charge in said electrically conductive composites thereby inducing distortion in each of said piezoelectrically active members whereby the device is deformed in a controlled manner.
Claim 8
Dependent Claim
58 words
A device as claimed in claim 5 including a first layer of electrically conductive matrix material, a second layer of electrically conductive matrix material laminated to said first layer, a plurality of piezoelectrically active filaments imbedded in each of said layers, and said means place a predetermined level of charge on each of said layers of matrix material.
Claim 9
Dependent Claim
18 words
A device as claimed in claim 6 wherein the filaments are substantially parallel in each of said layers.
Claim 10
Dependent Claim
13 words
A device as claimed in claim 6 wherein the filaments are lithium niobate.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |