US5909495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise canceling improvement to stethoscope
Assignee: Andrea Electronics Corp
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Filing: 1997-11-03
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Granted: 1999-06-01
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Expires: 2017-11-03
Abstract
Abstract A stethoscope for reducing background noise comprising a housing having a receiver portion and an audio output means; the receiver portion having a plurality of noise ports; a microphone isolator located within the receiver portion; a noise canceling microphone having a front end and a back end enclosed by the microphone isolator; an acoustical tube having an acoustical waveguide connected to the microphone isolator for channeling an input signal; a chest piece having a sound diaphragm pickup for receiving the input sound and noise signal connected to acoustic tube to permit a pressure gradient noise porting placed at the back end of the microphone and internally behind the noise port.
Inventors
- 👤 Douglas Andrea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:38
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A stethoscope for reducing background noise comprising: a housing having a receiver portion and an audio output means; the receiver portion having a plurality of noise ports; a microphone isolator located within the receiver portion; a noise canceling microphone having a front end and a back end enclosed by the microphone isolator; an acoustical tube having an acoustical waveguide connected to the microphone isolator for channeling an input signal; a chest piece having a sound diaphragm pickup for receiving the input sound and noise signal connected to said acoustical tube to permit a pressure gradient noise porting by said noise ports placed at the back end of the microphone which is internally located before the noise ports.
Claim 2
Dependent Claim
117 words
A stethoscope for reducing background noise comprising: a housing having a receiver portion and an audio output means; the receiver portion having a plurality of noise ports; a microphone isolator located within the receiver portion; a noise canceling microphone having a front end and a back end enclosed by the microphone isolator; an acoustical tube having an acoustical waveguide connected to the microphone isolator for channeling an input signal; a chest piece having a sound diaphragm pickup for receiving the input sound and noise signal connected to said acoustical tube to permit a pressure gradient noise porting by said noise ports placed at the back end of the microphone which is internally located before the noise ports.
Claim 3
Dependent Claim
15 words
The stethoscope of claim 1 wherein the noise canceling microphone is a pressure gradient microphone.
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) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |