Patent US3562428A successfully refreshed from Google Patents.
US3562428A
Expired / Lapsed
US
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Arrangements for use in the examination of sound wave patterns
Assignee: EMI Cossor Electronics Ltd
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Filing: 1967-07-12
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Granted: 1971-02-09
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Expires: 1987-07-12
Abstract
Abstract A transducer circuit for use in a stethoscope. Signals which are in an inaudible or difficult to hear frequency range are converted to signal variations in an easily heard frequency range by using modulating and mixing techniques.
Inventors
- 👤 Bertrand Julian Starkey
- 👤 Robert John Felix Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
H; H04; H04R; H04R3/00; A; A61; A61B; A61B7/00; A61B7/02; A61B7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A. FIRST TRANSDUCER FOR CONVERTING AN INCIDENT ACOUSTIC WAVE PATTERN, INCLUDING COMPONENTS WHICH BECAUSE OF THEIR FREQUENCY ARE INAUDIBLE OR DIFFICULT TO HEAR, TO AN ELECTRICAL INPUT SIGNAL; B. A FIRST OSCILLATOR FOR GENERATING OSCILLATIONS AT A CARRIER FREQUENCY; C. MEANS FOR FREQUENCY MODULATING SAID OSCILLATIONS BY SAID INPUT SIGNAL TO PRODUCE A FREQUENCY VARIATION WITH COMPONENTS SIGNAL IN A MORE EASILY AUDIBLE FREQUENCY REGION; D. A SECOND OSCILLATOR FOR GENERATING OSCILLATIONS AT SAID CARRIER FREQUENCY; E. MEANS FOR DERIVING A DIFFERENCE FREQUENCY SIGNAL RELATING TO THE FREQUENCY DIFFERENCE BETWEEN THE MODULATED OSCILLATIONS AND THE OSCILLATIONS GENERATED BY SAID SECOND OSCILLATOR, F. A SECOND TRANSDUCER FOR CONVERTING AN ELECTRICAL SIGNAL TO AN ACOUSTIC WAVE PATTERN; AND G. MEANS FOR APPLYING SAID DIFFERENCE FREQUENCY SIGNAL TO SAID SECOND TRANSDUCER TO PRODUCE AN AUDIBLE ACOUSTIC OUTPUT WAVE PATTERN RELATED TO SAID INCIDENT ACOUSTIC WAVE PATTERN AND WITH THE CARRIER REMOVED.
Claim 2
Dependent Claim
148 words
A. FIRST TRANSDUCER FOR CONVERTING AN INCIDENT ACOUSTIC WAVE PATTERN, INCLUDING COMPONENTS WHICH BECAUSE OF THEIR FREQUENCY ARE INAUDIBLE OR DIFFICULT TO HEAR, TO AN ELECTRICAL INPUT SIGNAL; B. A FIRST OSCILLATOR FOR GENERATING OSCILLATIONS AT A CARRIER FREQUENCY; C. MEANS FOR FREQUENCY MODULATING SAID OSCILLATIONS BY SAID INPUT SIGNAL TO PRODUCE A FREQUENCY VARIATION WITH COMPONENTS SIGNAL IN A MORE EASILY AUDIBLE FREQUENCY REGION; D. A SECOND OSCILLATOR FOR GENERATING OSCILLATIONS AT SAID CARRIER FREQUENCY; E. MEANS FOR DERIVING A DIFFERENCE FREQUENCY SIGNAL RELATING TO THE FREQUENCY DIFFERENCE BETWEEN THE MODULATED OSCILLATIONS AND THE OSCILLATIONS GENERATED BY SAID SECOND OSCILLATOR, F. A SECOND TRANSDUCER FOR CONVERTING AN ELECTRICAL SIGNAL TO AN ACOUSTIC WAVE PATTERN; AND G. MEANS FOR APPLYING SAID DIFFERENCE FREQUENCY SIGNAL TO SAID SECOND TRANSDUCER TO PRODUCE AN AUDIBLE ACOUSTIC OUTPUT WAVE PATTERN RELATED TO SAID INCIDENT ACOUSTIC WAVE PATTERN AND WITH THE CARRIER REMOVED.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |