Headset amplifier

Details Headset amplifier Headset amplifier

1993-09-03

1995-03-07

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Amplifying

379387, 379441, 379442, 381106, 381187, 381 4, H04M 100

Patent

active

053965515

ABSTRACT:
A headset amplifier, adapted for use with a voltage source such as a battery, includes a time-out-timer circuit for deactivating the headset amplifier after a first predetermined period of time and for reactivating the amplifier in response to a signal fed to an input port of the time-out-timer circuit.

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patent: 4879746 (1989-11-01), Young
patent: 4917504 (1990-04-01), Scott et al.
patent: 4918726 (1990-04-01), Snyder
patent: 4928306 (1990-05-01), Biswas et al.
patent: 4930156 (1990-05-01), Norris
patent: 4951002 (1990-08-01), Hanon
patent: 4975949 (1990-12-01), Wimsatt et al.
patent: 5036536 (1991-07-01), Hanon et al.
patent: 5058155 (1991-10-01), Larsen
patent: 5099514 (1992-03-01), Acree
patent: 5185789 (1993-02-01), Hanon et al.

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