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US3110770A
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Apparatus for use in stethoscopy
Assignee: Faraday Electronic Instruments Ltd
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Filing: 1960-08-29
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Granted: 1963-11-12
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Expires: 1980-08-29
Abstract
No abstract record available.
Inventors
- 👤 Howell Derek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:00
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/43; A61B5/4306; A61B5/4343; A61B5/4362; A61B5/02; A61B5/024; A61B5/02411; A61B7/00; A61B7/02; A61B7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
AN ELECTRONIC STETHOSCOPE COMPRISING A MICROPHONE FOR CONVERTING SOUNDS INTO AUDIO FREQUENCY OSCILLATIONS, A FREQUENCY MULTIPLIER CONNECTED TO THE OUTPUT OF THE MICROPHONE FOR PRODUCING HARMONICS OF THE ORIGINAL AUDIO FREQUENCY OSCILLATIONS, WHICH HARMONICS ARE STILL IN THE AUDIO FREQUENCY RANGE, A LOW PASS FILTER CONNECTED TO THE OUTPUT OF THE FREQUENCY MULTIPLIER AND PASSING ALL OF THE OUTPUT FREQUENCIES OF SAID FREQUENCY MULTIPLIER WITHIN THE PASSBAND OF SAID LOW PASS FILTER, AN AMPLIFIER, VARIABLE CONTROL MEANS CONNECTED BETWEEN THE OUTPUT FROM THE MICROPHONE AND THE OUTPUT FROM THE LOW PASS FILTER, SAID VARIABLE CONTROL MEANS HAVING AN ADJUSTABLE OUTPUT CONNECTED TO THE INPUT OF SAID AMPLIFIER FOR APPLYING TO SAID AMPLIFIER AN ADJUSTABLE MIXTURE OF THE OUTPUT FROM THE MICROPHONE AND THE OUTPUT FROM THE LOW PASS FILTER AND A TRANSDUCER CONNECTED TO THE OUTPUT OF SAID AMPLIFIER FOR CONVERTING THE OUTPUT SIGNALS FROM SAID AMPLIFIER TO AUDIBLE SOUNDS.
Claim 2
Dependent Claim
150 words
AN ELECTRONIC STETHOSCOPE COMPRISING A MICROPHONE FOR CONVERTING SOUNDS INTO AUDIO FREQUENCY OSCILLATIONS, A FREQUENCY MULTIPLIER CONNECTED TO THE OUTPUT OF THE MICROPHONE FOR PRODUCING HARMONICS OF THE ORIGINAL AUDIO FREQUENCY OSCILLATIONS, WHICH HARMONICS ARE STILL IN THE AUDIO FREQUENCY RANGE, A LOW PASS FILTER CONNECTED TO THE OUTPUT OF THE FREQUENCY MULTIPLIER AND PASSING ALL OF THE OUTPUT FREQUENCIES OF SAID FREQUENCY MULTIPLIER WITHIN THE PASSBAND OF SAID LOW PASS FILTER, AN AMPLIFIER, VARIABLE CONTROL MEANS CONNECTED BETWEEN THE OUTPUT FROM THE MICROPHONE AND THE OUTPUT FROM THE LOW PASS FILTER, SAID VARIABLE CONTROL MEANS HAVING AN ADJUSTABLE OUTPUT CONNECTED TO THE INPUT OF SAID AMPLIFIER FOR APPLYING TO SAID AMPLIFIER AN ADJUSTABLE MIXTURE OF THE OUTPUT FROM THE MICROPHONE AND THE OUTPUT FROM THE LOW PASS FILTER AND A TRANSDUCER CONNECTED TO THE OUTPUT OF SAID AMPLIFIER FOR CONVERTING THE OUTPUT SIGNALS FROM SAID AMPLIFIER TO AUDIBLE SOUNDS.
References Cited (Backward Citations)
US1930898A
Cited
US2117739A
Cited
US2157178A
Cited
US2686831A
Cited
US2723316A
Cited
US2852671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-11 | 1967-05-13 | 1967-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-11 | 1971-05-13 | 1971-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-11 | 1975-05-13 | 1975-11-12 | $7700.00 | Window Closed / Lapsed |