US4596899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone hearing aid
Assignee: Nortel Networks Ltd
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Filing: 1984-09-14
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Granted: 1986-06-24
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Expires: 2004-09-14
Abstract
Abstract A portable telephone hearing aid having an acousto-acoustic/magnetic amplifier providing a maximum gain of 20 dB has a circular housing at one end of a U-shaped resilient clip member for attaching it to the telephone receiver in a handset. A battery compartment, also housing an ON/OFF switch, and a gain control wheel, is located at the other end of the U-shaped clip.
Inventors
- 👤 Jacek J. Wojcik
- 👤 Andrzej Przybysz
- 👤 Peter R. Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:32
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215; H04M1/2155
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A telephone hearing aid for attachment to a telephone handset, the hearing aid having a disc shaped circular symmetric housing for an acousto-electric input transducer, an amplifier, a transformer having a primary winding connected in series with the input transducer and a secondary winding series connected to both an electro-acoustic output transducer and an electro-magnetic output transducer, said transducers being circular symmetric and concentrically located on the axis of the housing, said housing having a domed rear face adapted to fit into a dished face of the telephone handset receiver, and a resilient curved band extending from the housing and terminating at a self contained power source, said band enabling spring mounting of the telephone hearing aid onto a telephone handset with the telephone handset receiver gripped between said housing and said power source.
Claim 2
Dependent Claim
134 words
A telephone hearing aid for attachment to a telephone handset, the hearing aid having a disc shaped circular symmetric housing for an acousto-electric input transducer, an amplifier, a transformer having a primary winding connected in series with the input transducer and a secondary winding series connected to both an electro-acoustic output transducer and an electro-magnetic output transducer, said transducers being circular symmetric and concentrically located on the axis of the housing, said housing having a domed rear face adapted to fit into a dished face of the telephone handset receiver, and a resilient curved band extending from the housing and terminating at a self contained power source, said band enabling spring mounting of the telephone hearing aid onto a telephone handset with the telephone handset receiver gripped between said housing and said power source.
Claim 3
Dependent Claim
28 words
The telephone hearing aid as defined in claim 1, said amplifier comprising an electronic voice-band amplifier having an output driving both said electro-acoustic transducer and said electro-magnetic transducer.
Claim 4
Dependent Claim
40 words
The telephone hearing aid as defined in claim 1, said housing having an annular sound absorbent cushion surrounding its periphery for attenuating sound between the input and the output when the telephone handset receiver is pressed against a human ear.
Claim 5
Dependent Claim
17 words
The telephone hearing aid as defined in claim 1, wherein the input transducer comprises an electret microphone.
Claim 6
Dependent Claim
37 words
The telephone hearing aid as defined in claim 1, in which the eletro-magnetic output transducer comprises a cylindrical magnetic-field producing coil within said housing, said coil having its cylindrical axis substantially perpendicular to the telephone handset receiver.
Claim 7
Dependent Claim
78 words
A telephone hearing aid as claimed in claim 1 said self contained power source comprising a battery compartment adapted to receive a battery to power said amplifier, said housing connected to said battery compartment by said resilient curved band; and wherein the acoustic-electric transducer on one side of said housing faces the telephone handset receiver and the electro-acoustic transducer is on the opposed side of said housing and radiates in a direction away from the telephone handset receiver.
Claim 8
Dependent Claim
29 words
The telephone hearing aid as defined in claim 6, said electronic voice-band amplifier comprising a potentiometer for adjusting its electrical gain by a user of said telephone hearing aid.
Claim 9
Dependent Claim
25 words
The telephone hearing aid as defined in claim 7, said acousto-electric transducer being an electret microphone, and said electro-acoustic transducer being a hearing aid-type receiver.
Claim 10
Dependent Claim
21 words
The telephone hearing aid as defined in claim 8, said electro-magnetic transducer being a cylindrical magnetic-field producing coil within said housing.
Claim 11
Dependent Claim
26 words
The telephone hearing aid as defined in claim 9, said coil having its cylinder axis substantially perpendicular to the receiver when said housing is in place.
Claim 12
Dependent Claim
36 words
The telephone hearing aid as defined in claim 10, said housing having an annular sound absorbent cushion surrounding its periphery for attenuating sound between the input and the output particularly when pressed against a human ear.
Claim 13
Dependent Claim
30 words
The telephone hearing aid as defined in claim 11, said housing having an input aperture in said one side surrounded by a sound attenuating O-ring when contiguous said telephone receiver.
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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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |