Telephone privacy protector

Details Telephone privacy protector Telephone privacy protector

1986-05-22

1988-05-24

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

Lockout or double use signalling

379387, H04M 168

Patent

active

047471280

ABSTRACT:
This invention is a telephone privacy protector to be interposed between a common exchange line and each one of at least two telephones sharing the line. The device includes a voice connecting circuit connected between a respective phone and the line; a control circuit operatively engaging the connecting circuit, and having an on- and an off-state, and a trigger having a threshold voltage responsive to the line voltage controllingly engaging the control circuit to trigger it into its on-state to provide a voice connection between the telephone and the common line in response to the line voltage exceeding said threshold voltage.

REFERENCES:
patent: 2001095 (1935-05-01), Deakin
patent: 3499121 (1970-03-01), McIntosh et al.
patent: 3504128 (1970-03-01), Steinman et al.
patent: 3514544 (1970-05-01), Chambers, Jr.
patent: 4000376 (1975-03-01), Springer
patent: 4039759 (1977-08-01), Taylor
patent: 4169217 (1979-09-01), Szanto et al.
patent: 4332983 (1982-06-01), Vakill

Affiliated with

Also associated with

Rating

Telephone privacy protector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone privacy protector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone privacy protector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1063389