US3830979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone handset amplifier
Assignee: TONE COMMANDER SYST Inc
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Filing: 1973-05-02
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Granted: 1974-08-20
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Expires: 1993-05-02
Abstract
Abstract A receiver amplifier attachment for a Trimline telephone handset which is installed without modification of the handset. The amplifier attachment consists of a transistorized amplifier circuit mounted on a flexible strip and employing printed circuitry. The strip is slit longitudinally at one end portion and the two segments thus defined have respective printed and terminals with printed connections to the input and output of the amplifier circuit. With the back cover of the handset removed, these are clamped on opposite sides of the normal receiver board terminals of the handset by a Nylon screw which is substitured for the normal metal connection screw, whereby the amplifier is connected into the handset receiver circuit. The strip has a large aperture at its opposite end portion to define a loop which is engaged over and interlocks with the peripheral shoulder of the handset connection plug receptacle so that the strip is stretched over the handset. Respective flexible terminal wires are provided on the strip to connect the amplifier to the transmitter supply voltage and common terminals of the handset. A volume control potentiometer is mounted on the outer margin of the apertured end portion of the strip. The attachment is thus substantially fully housed beneath the back cover of the handset when the cover is replaced.
Inventors
- 👤 Intosh A Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:50
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
144 words
In a telephone handset assembly having a receiver provided with an input terminal and a circuit board element carrying an output terminal located over and in registry with said receiver input terminal, an amplifier receivable in the handset assembly and having an input terminal leg engageable on said output terminal overlying said circuit board element and an output terminal leg engageable on said receiver input terminal underlying said circuit board element, insulating fastening means extending through said input terminal leg, said circuit board element and said output terminal leg and clamping said amplifier input terminal leg to said output terminal and said amplifier output leg to said receiver input terminal, whereby to connect said amplifier between said circuit board output terminal and said receiver input terminal, voltage supply means in the handset, and circuit means operatively connecting said amplifier to said voltage supply means.
Claim 2
Dependent Claim
144 words
In a telephone handset assembly having a receiver provided with an input terminal and a circuit board element carrying an output terminal located over and in registry with said receiver input terminal, an amplifier receivable in the handset assembly and having an input terminal leg engageable on said output terminal overlying said circuit board element and an output terminal leg engageable on said receiver input terminal underlying said circuit board element, insulating fastening means extending through said input terminal leg, said circuit board element and said output terminal leg and clamping said amplifier input terminal leg to said output terminal and said amplifier output leg to said receiver input terminal, whereby to connect said amplifier between said circuit board output terminal and said receiver input terminal, voltage supply means in the handset, and circuit means operatively connecting said amplifier to said voltage supply means.
Claim 3
Dependent Claim
98 words
The telephone handset assembly of claim 1, and wherein said assembly includes an elongated main housing in one end of which the receiver is contained and having a projection at its other end, said amplifier being provided with and being mounted on a support in the form of an elongated flexible strip, said input and output terminal legs comprising side-by-side relatively flexible end portions of said strip, and means on the strip lockingly engageable with the projection when the strip is reversely bent over the housing, whereby the strip can be secured in overlying relation to the housing.
Claim 4
Dependent Claim
34 words
The telephone handset assembly of claim 2, and wherein said strip is formed with an aperture at its end portion opposite said terminal legs, said locking means comprising an edge portion of said aperture.
Claim 5
Dependent Claim
30 words
The telephone handset assembly of claim 3, and wherein said amplifier is provided with a volume control member mounted on the end portion of said strip outwardly adjacent said aperture.
Claim 6
Dependent Claim
47 words
The telephone handset assembly of claim 4, and wherein said insulating fastening means comprises a screw of insulating material engaged through said circuit board element and through said amplifier input terminal leg, said circuit board output terminal, said amplifier output terminal leg and said receiver input terminal.
Claim 7
Dependent Claim
44 words
The telephone handset assembly of claim 5, and a bracket member secured between said volume control member and said strip, said bracket member having finger portions extending on opposite sides of said projection when said aperture edge portion is lockingly engaged with said projection.
Claim 8
Dependent Claim
37 words
The telephone handset assembly of claim 6, and wherein said housing is provided with a removable back cover having a bottom edge portion clampingly engageable with said finger portions when the cover is mounted on the housing.
Claim 9
Dependent Claim
92 words
A telephone handset amplifier attachment comprising an elongated strip of flexible insulating material shaped to be received in a handset, an amplifier mounted on the intermediate portion of said strip, said strip being formed at one end with relatively flexible normally coplanar side-by-side elongated leg portions, respective apertured terminals on the ends of said leg portions, said leg portions being sufficiently flexible so that they may be at times suPerimposed to bring the apertured terminals into registry, and circuit means respectively connecting said terminals to the input and output of the amplifier.
Claim 10
Dependent Claim
92 words
A telephone handset amplifier attachment comprising an elongated strip of flexible insulating material shaped to be received in a handset, an amplifier mounted on the intermediate portion of said strip, said strip being formed at one end with relatively flexible normally coplanar side-by-side elongated leg portions, respective apertured terminals on the ends of said leg portions, said leg portions being sufficiently flexible so that they may be at times suPerimposed to bring the apertured terminals into registry, and circuit means respectively connecting said terminals to the input and output of the amplifier.
Claim 11
Dependent Claim
29 words
The telephone handset amplifier attachment of claim 8, and wherein said strip is formed adjacent its opposite end with an aperture defining a locking edge at said opposite end.
Claim 12
Dependent Claim
36 words
The telephone handset amplifier attachment of claim 8, and wherein said amplifier comprises a PNP transistor and an NPN transistor with their collector-emitter circuits connected in parallel to render the amplifier insensitive to supply voltage polarity.
Claim 13
Dependent Claim
31 words
The telephone handset amplifier attachment of claim 9, and wherein the amplifier is provided with a volume control member mounted on said opposite end of the strip outwardly adjacent said aperture.
Claim 14
Dependent Claim
37 words
The telephone handset amplifier attachment of claim 11, and a bracket member secured between said volume control member and said opposite end of the strip, said bracket member having a pair of spaced inwardly extending finger elements.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |