Patent US3833825A successfully refreshed from Google Patents.
US3833825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band electroacoustic transducer
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1973-04-11
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Granted: 1974-09-03
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Expires: 1993-04-11
Abstract
Abstract A thickness-mode electroacoustic transducer wherein an active body of non-uniform thickness is employed to provide uniform wide-band frequency response. The body may be wedge-shaped, having non-parallel planar major surfaces. At least one of the major surfaces is subdivided into a two-dimensional array of poles by means of grooves formed in the surface for the purpose of providing improved frequency and directional response.
Inventors
- 👤 D Haan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
In a thickness-mode electroacoustic transducer of the type including an active body having two major surfaces, at least one of which is subdivided by means of grooves to form a twodimensional array of poles, and electrode means for carrying electrical signals to or from the poles, the improvement which comprises an active body wherein the major surfaces are nonparallel so that said body is of non-uniform thickness.
Claim 2
Dependent Claim
67 words
In a thickness-mode electroacoustic transducer of the type including an active body having two major surfaces, at least one of which is subdivided by means of grooves to form a twodimensional array of poles, and electrode means for carrying electrical signals to or from the poles, the improvement which comprises an active body wherein the major surfaces are nonparallel so that said body is of non-uniform thickness.
Claim 3
Dependent Claim
34 words
The transducer of claim 1 further including a fluid tight housing having a window transparent to acoustic energy, and means for securing the assembly comprising said body and said electrode means within said housing.
Claim 4
Dependent Claim
30 words
The transducer of claim 2 wherein said body is positioned within said housing so that said poles are generally directed toward the window, said assembly being bonded to the window.
Claim 5
Dependent Claim
44 words
A wide-band thickness-mode electroacoustic transducer comprising an active body having two nonparallel major surfaces at least one of which is subdivided by means of grooves to form a two-dimensional array of poles, and electrode means for carrying electrical signals to or from said poles.
Claim 6
Dependent Claim
44 words
A wide-band thickness-mode electroacoustic transducer comprising an active body having two nonparallel major surfaces at least one of which is subdivided by means of grooves to form a two-dimensional array of poles, and electrode means for carrying electrical signals to or from said poles.
Claim 7
Dependent Claim
16 words
The transducer of claim 4 wherein said body is of tapered configuration having planar major surfaces.
Claim 8
Dependent Claim
31 words
The transducer of claim 5 wherein the grooves in one major surface of said body extend to a uniform distance from the other major surface, thereby forming poles of varying heights.
Claim 9
Dependent Claim
29 words
The transducer of claim 6 wherein the grooves are located along two sets of equally-spaced parallel lines, each set intersecting the other so as to form a regular pattern.
Claim 10
Dependent Claim
25 words
The transducer of claim 7 wherein said electrode means comprises metal foil bonded to the major surfaces of said body by means of an adhesive.
Claim 11
Dependent Claim
51 words
The transducer of claim 8 wherein the assembly comprising said body and said electrode means is contained within a water tIght housing having a window transparent to acoustic energy, said body being positioned so that the poles thereof are generally oriented toward the window, said assembly being bonded to the window.
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |