Electronic audio signalling device for telephones

USRE31398E · kind E · reissue

Assignee

• Floyd Bell Inc. · US

Inventors

• Terry D. Bush · Westerville, US
• Dennis J. Denen · Columbus, US

Key dates

• Filing date: Jun 22, 1981
• Grant date: Sep 27, 1983
• Expiry date: Jun 22, 2001

Classification

• Technology area (CPC —): General

Abstract

A signalling device to be substituted for the usual electromechanical ringer of a telephone, either as a replacement for that ringer in existing telephone instruments or as a part of the original manufactured instrument. It includes solid-state circuitry for eliminating noise pulses and an electronic oscillator circuit which will operate effectively on a minimum current supply along with a mechanical arrangement of components to obtain a compact unit with a folded horn or Helmholtz resonator type acoustical loading system and adjustable volume control.