Patent US1261090A successfully refreshed from Google Patents.
Patent US3763463A successfully refreshed from Google Patents.
US3763463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrapnel sonar
Assignee: United States Department of the Navy
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Filing: 1972-09-21
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Granted: 1973-10-02
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Expires: 1992-09-21
Abstract
Abstract The invention provides an unique hand held device including a rotating transducer generating two high frequency signals which cause a nonlinear liquid to generate a low frequency signal which is then projected thru the liquid medium and a low pass filter in such a way as to direct the low frequency sound signal into animal tissue for the purpose of detecting foreign bodies located therein thru a return echo that is displayed on a cathode ray tube mounted in the device.
Inventors
- 👤 T Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:45
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/004; A; A61; A61B; A61B8/00; A61B8/08; A61B8/0833; G01; G01S; G01S15/00; G01S15/02; G01S15/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
209 words
An improved low frequency sound generator and receiver for locating foreign bodies in animal tissue comprising: a. a housing having first and second ends; b. a first rotatable member mounted inside siad housing; c. a second rotatable member mounted on said first rotatable member; d. a transducer mounted on said second rotatable member; e. means for rotating said first and second rotatable members said transducer being moved thereby in a prescribed pattern; f. means coupled to said transducer causing said transducer to generate first and second frequencies; g. a cavity in said housing adjacent to said transducer, said cavity being filled with a liquid wherein said first and second frequencies undergo nonlinear interaction to produce a highly directive difference frequency radiation; h. a low pass filter mounted on said first end of said housing closing one side of said cavity, for absorbing the first and second frequencies and for contacting animal tissue to be scanned; i. a display means mounted at the second end of said housing; and j. electric circuit means connected to said transducer and said display means for causing said display means to depict the position of said transducer in its prescribed pattern and to show any echo signal received from foreign bodies in said tissue.
Claim 2
Dependent Claim
209 words
An improved low frequency sound generator and receiver for locating foreign bodies in animal tissue comprising: a. a housing having first and second ends; b. a first rotatable member mounted inside siad housing; c. a second rotatable member mounted on said first rotatable member; d. a transducer mounted on said second rotatable member; e. means for rotating said first and second rotatable members said transducer being moved thereby in a prescribed pattern; f. means coupled to said transducer causing said transducer to generate first and second frequencies; g. a cavity in said housing adjacent to said transducer, said cavity being filled with a liquid wherein said first and second frequencies undergo nonlinear interaction to produce a highly directive difference frequency radiation; h. a low pass filter mounted on said first end of said housing closing one side of said cavity, for absorbing the first and second frequencies and for contacting animal tissue to be scanned; i. a display means mounted at the second end of said housing; and j. electric circuit means connected to said transducer and said display means for causing said display means to depict the position of said transducer in its prescribed pattern and to show any echo signal received from foreign bodies in said tissue.
Claim 3
Dependent Claim
47 words
The improved low frequency sound generator and receiver of claim 1 wherein said display means consists of a cathode ray tube mounted in said second end of said housing and said electrical circuit means are mounted external to said housing and connected thereto by suitable wiring means.
Claim 4
Dependent Claim
44 words
The improved low frequency sound generator and receiver of claim 2 wherein said housing is substantially cylindrical in shape and said low pass filter is composed of a rubber booted hemispherical shaped member for absorbing any high frequency sound signals passing thru said liquid.
Claim 5
Dependent Claim
29 words
The improved low frequency sound generator and receiver of claim 3 wherein said first rotatable member is driven by electrical means about the major longitudinal axis of said housing.
Claim 6
Dependent Claim
30 words
The improved low frequency sound generator and receiver of claim 4 wherein the second rotatable member is driven by a gearing means actuated by rotation of said first rotatable member.
Claim 7
Dependent Claim
58 words
The improved low frequency sound generator and receiver of claim 5 wherein there is provided first and second resolvers for indicating the relative position of said first and said second rotatable members by generating an electrical signal coupled to the deflection system of said cathode ray tube to provide a signal trace indicating the path of said transducer.
Claim 8
Dependent Claim
22 words
The improved low frequency sound generator and receiver of claim 6 wherein said liquid in said cavity consists of a nonlinear liquid.
Claim 9
Dependent Claim
38 words
The improved low frequency sound generator and receiver of claim 7 wherein said electrical circuit means include a strobic logic circuit to intensify range gated portions of the echo field and is a sagittal section of this field.
References Cited (Backward Citations)
US3613069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |