Party line telephone system

Details Party line telephone system Party line telephone system

1979-06-15

1981-03-24

Brigance, Gerald L.

179 18BF, 179 37, 179 84SS, H04M 902

Patent

active

042582300

ABSTRACT:
A party line telephone system capable of effecting selective calling from one station to another and particularly adapted for use in battery-powered two-wire telephone systems such as those used in underground mines where consideration of intrinsic safety, low power consumption and compatibility with existing equipment are paramount. The system of the invention is such that the receiver at each station in the network need not be connected to a battery-powered source for any prolonged period of time except when that station is being called by another station for a private conversation, thereby conserving battery power.

REFERENCES:
patent: 3336444 (1967-08-01), Piechocki
patent: 3542968 (1970-11-01), Mercer
patent: 3668317 (1972-06-01), Vitalo
patent: 3859475 (1975-01-01), Wulfsberg et al.
patent: 3909547 (1975-09-01), Day
patent: 3912875 (1975-10-01), Katz
patent: 4006316 (1977-02-01), Bolgiano
patent: 4037059 (1977-07-01), Stine

Affiliated with

Also associated with

Rating

Party line telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2409370