Patent US3622958A successfully refreshed from Google Patents.
US3622958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic detection apparatus
Assignee: NAT RES DEV
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Filing: 1969-05-28
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Granted: 1971-11-23
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Expires: 1989-05-28
Abstract
Abstract Accoustic detection apparatus for detecting the presence of gas bubbles in a liquid, for example, blood, comprises a transducer and a detector which is selectively tuned to detect a frequency other than that transmitted and which is generated in the medium due to the nonlinear effect of the bubbles. A single frequency may be transmitted and its second harmonic detected or else two frequency components transmitted and their sum or difference detected.
Inventors
- 👤 David Gordon Tucker
- 👤 Vernon Gearon Welsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:47
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/48; A61B8/481; A61M; A61M5/00; A61M5/36; A61M5/365; G; G01; G01N; G01N29/00; G01N29/02; G01N29/032; G01N29/34; G01N29/348; G01N29/36; G01N29/42; G01N2291/00; G01N2291/01; G01N2291/014; G01N2291/02; G01N2291/024; G01N2291/02433; G01N2291/02491; G01N2291/10; G01N2291/101; G01N2291/102
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least one predetermined frequency into the blood if said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of a frequency harmonically related to said at least one predetermined frequency, which related frequency is generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said at least one predetermined frequency thereby ensuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
Claim 2
Dependent Claim
124 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least one predetermined frequency into the blood if said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of a frequency harmonically related to said at least one predetermined frequency, which related frequency is generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said at least one predetermined frequency thereby ensuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
Claim 3
Dependent Claim
18 words
Apparatus as claimed in claim 1 in which the said transducer also acts as the acoustic detection means.
Claim 4
Dependent Claim
17 words
Apparatus as claimed in claim 1 in which the acoustic detection means comprises a separate receiving transducer.
Claim 5
Dependent Claim
101 words
Apparatus for monitoring gas bubbles in a liquid, said apparatus comprising: a transducer adapted for transmitting acoustic waves of at least one predetermined frequency into said liquid, acoustic detection means adapted for receiving acoustic waves of a frequency harmonically related to said at least one predetermined frequency, which related frequency is generated in said liquid due to the presence of gas bubblEs therein, and filter means electrically connected to said acoustic detection means for blocking said at least one predetermined frequency thereby ensuring that the output of said filter means is a reliable indication of the presence of said gas bubbles.
Claim 6
Dependent Claim
101 words
Apparatus for monitoring gas bubbles in a liquid, said apparatus comprising: a transducer adapted for transmitting acoustic waves of at least one predetermined frequency into said liquid, acoustic detection means adapted for receiving acoustic waves of a frequency harmonically related to said at least one predetermined frequency, which related frequency is generated in said liquid due to the presence of gas bubblEs therein, and filter means electrically connected to said acoustic detection means for blocking said at least one predetermined frequency thereby ensuring that the output of said filter means is a reliable indication of the presence of said gas bubbles.
Claim 7
Dependent Claim
120 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least a single predetermined frequency into the blood of said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of the second harmonic of said single predetermined frequency which second harmonic is generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said single predetermined frequency thereby insuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
Claim 8
Dependent Claim
120 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least a single predetermined frequency into the blood of said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of the second harmonic of said single predetermined frequency which second harmonic is generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said single predetermined frequency thereby insuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
Claim 9
Dependent Claim
122 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least two predetermined frequencies into the blood of said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of intermodulation components of said at least two predetermined frequencies which intermodulation components are generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said at least two predetermined frequencies thereby ensuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
Claim 10
Dependent Claim
122 words
Apparatus for monitoring gas bubbles in the blood of a diver, said apparatus comprising: a transducer adapted for application to the skin of a diver for transmitting an acoustic wave of at least two predetermined frequencies into the blood of said diver, acoustic detection means also adapted for application to the skin of said diver for receiving the acoustic waves of intermodulation components of said at least two predetermined frequencies which intermodulation components are generated in the blood due to the presence of gas bubbles therein, and filter means included in said detection means for blocking said at least two predetermined frequencies thereby ensuring that the output of said detection means is a reliable indication of the presence of said gas bubbles.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |