Communication controlling apparatus for a single-line telephone

Details Communication controlling apparatus for a single-line telephone Communication controlling apparatus for a single-line telephone

1995-04-21

1996-10-15

Chin, Wellington

Telephonic communications

Private or single line system

Doorbell system

379168, 379169, 379170, 379171, 379177, 379181, 379184, H04M 160, H04M 900, H04M 1300

Patent

active

055662331

ABSTRACT:
In a single-line telephone, there are a plurality of extension telephone sets connected by a telephone line and each extension telephone set is connected to a communication controlling apparatus. The communication controlling apparatus includes an alternating current coupler and a power supply thus allowing two extension telephone sets to communicate with each other without being disturbed by a busy tone.

REFERENCES:
patent: 4809317 (1989-02-01), Howe
patent: 4821319 (1989-04-01), Middleton
patent: 5179588 (1993-01-01), Nowicki
patent: 5208851 (1993-05-01), Blanchette
patent: 5454032 (1995-09-01), Pinard

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