Patent JPS527709A successfully refreshed from Google Patents.
US4689818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant peak control
Assignee: Sivantos Inc
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Filing: 1983-04-28
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Granted: 1987-08-25
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Expires: 2003-04-28
Abstract
Abstract A hearing aid having a microphone, an amplifier and a receiver for delivering the amplified sound to a user's ear, in which an adjustable resonant peak control is used to shift the frequency response of the amplifier to a lower frequency range in order to reduce feedback without substantial reduction in high frequency amplification or saturation levels.
Inventors
- 👤 Knud Ammitzboll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:57
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/45; H04R25/453; H04R25/50; H04R25/502; H04R25/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A hearing aid, comprising: (a) a receiver having an inductive characteristic and a frequency response curve, the receiver operating to convert electrical signals into audible sound; and (b) an adjustable electrical network in parallel with the receiver, the network having an RC characteristic chosen to coact with the inductive characteristic of the receiver in a manner that peaks in the response curve of the receiver are reduced by an amount which depends upon adjustment of the network.
Claim 2
Dependent Claim
77 words
A hearing aid, comprising: (a) a receiver having an inductive characteristic and a frequency response curve, the receiver operating to convert electrical signals into audible sound; and (b) an adjustable electrical network in parallel with the receiver, the network having an RC characteristic chosen to coact with the inductive characteristic of the receiver in a manner that peaks in the response curve of the receiver are reduced by an amount which depends upon adjustment of the network.
Claim 3
Dependent Claim
16 words
The hearing aid of claim 1, wherein the network comprises a resistance and capacitance in series.
Claim 4
Dependent Claim
11 words
The hearing aid of claim 2, wherein the resistance is variable.
Claim 5
Dependent Claim
31 words
The hearing aid of claim 1, further comprising an amplifier having an output connected to the receiver and to the network, and means for varying an output signal at said output.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |