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US4191861A Expired / Lapsed US ⏱️ 0.0 years remaining

Telephone amplifier

Assignee: Plantronics Inc
•
Filing: 1977-06-06
•
Granted: 1980-03-04
•
Expires: 1997-06-06
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Abstract

Abstract A telephone amplifier for connection to a telephone set and a telephone handset associated therewith, the telephone set having a modular plug receptacle connected to a pair of receiver input signal lines and to a pair of transmitter input supply lines, the handset having a modular plug and cord connected thereto. The telephone amplifier includes a housing mountable on the telephone set. The housing has a modular plug receptacle for receiving the modular plug associated with the telephone handset. The amplifier includes an amplifier modular plug and a cord connected thereto. The amplifier modular plug is adapted for insertion into the modular plug receptacle in the telephone set. The amplifier further includes an amplifier operatively connected to the housing modular plug receptacle and to the amplifier modular plug and cord for amplifying a signal received on the pair of telephone set receiver input signal lines. The amplifier is connected to the telephone set and handset without alteration of the receiver and transmitter input lines and the handset cord.

Inventors

  • 👤 Wesley F. Walker, Jr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 05:45
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/62

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 138 words
A telephone amplifier for connection to a telephone set and a telephone handset associated therewith, the telephone set having a modular plug receptacle and the handset having a cord and a modular plug connected thereto, comprising; a housing having a modular plug receptacle for receiving said modular plug associated with said telephone handset cord; means for mounting said housing on a wall of said telephone set; an amplifier modular plug and a cord connected thereto, said amplifier modular plug being adapted for insertion into said modular plug receptacle in the telephone set; a transformer disposed within said housing and connected to said amplifier modular plug and cord; and amplifier means, disposed within said housing, having an output and an input, said output being connected to said housing modular plug receptacle and said input being connected to said transformer.
Claim 2
Dependent Claim 138 words
A telephone amplifier for connection to a telephone set and a telephone handset associated therewith, the telephone set having a modular plug receptacle and the handset having a cord and a modular plug connected thereto, comprising; a housing having a modular plug receptacle for receiving said modular plug associated with said telephone handset cord; means for mounting said housing on a wall of said telephone set; an amplifier modular plug and a cord connected thereto, said amplifier modular plug being adapted for insertion into said modular plug receptacle in the telephone set; a transformer disposed within said housing and connected to said amplifier modular plug and cord; and amplifier means, disposed within said housing, having an output and an input, said output being connected to said housing modular plug receptacle and said input being connected to said transformer.
Claim 3
Dependent Claim 27 words
The telephone amplifier according to claim 1 wherein said means for mounting said housing comprises double-back adhesive means for removably mounting said housing on said telephone set.
Claim 4
Dependent Claim 70 words
The telephone amplifier according to claim 1 wherein said means for mounting said housing comprises a bracket assembly having at least a pair of spaced vertical walls defining a slot within which a portion of said telephone set is snugly seated, a support plate connected to said pair of spaced vertical walls for supporting said housing, and a pair of legs connected to said support plate for supporting the same.
Claim 5
Dependent Claim 28 words
The telephone amplifier according to claim 1 including rectifier means connected to said amplifier modular plug and cord for supplying a dc bias signal to said amplifier means
Claim 6
Dependent Claim 34 words
The telephone amplifier according to claim 1 wherein said housing is provided with a slot, and said amplifier means includes an adjustable potentiometer having a rotary dial, said rotary dial protruding through said slot.

References Cited (Backward Citations)

US2885484A Cited
US3254160A Cited
US3444329A Cited
US3997734A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-03-04 1983-09-03 1984-03-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-03-04 1987-09-03 1988-03-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-03-04 1991-09-03 1992-03-04 $7700.00 Window Closed / Lapsed

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