Line status indicator for use with telephones sharing a single l

Details Line status indicator for use with telephones sharing a single l Line status indicator for use with telephones sharing a single l

1993-08-03

1996-07-02

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379376, 379396, 379164, H04M 100

Patent

active

055331173

ABSTRACT:
The present invention relates to home telephone accessary and more specifically to an accessary that turns on a green light and a buzzer when the home phone line is open, and a red light when the line is in use. This invention is useful especially for those who share one telephone line with many other people.

REFERENCES:
patent: 3906168 (1975-09-01), McEowen
patent: 3944752 (1976-03-01), Stearn et al.
patent: 4031333 (1977-06-01), Fouratt
patent: 4169217 (1979-09-01), Szanto et al.
patent: 4228324 (1980-10-01), Rasmussen et al.
patent: 4546214 (1985-08-01), Laing
patent: 4653094 (1987-03-01), Rasmussen et al.
patent: 4723279 (1988-02-01), Field
patent: 4899372 (1990-02-01), Wahi et al.
patent: 5210791 (1993-05-01), Krasik

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