Pin fraud and shock prevention system

Details Pin fraud and shock prevention system Pin fraud and shock prevention system

1990-04-17

1991-06-04

Schreyer, Stafford D.

Telephonic communications

With check operated control

Fraud or interference prevention

194202, H04M 1702

Patent

active

050220730

ABSTRACT:
A pin fraud and shock prevention circuit for a pay telephone which has a receiver and transmitter, a tip and ring conductor forming a current loop connecting the pay telephone to a telephone exchange, and which has a current sensor in the ring conductor, a plurality of current switches coupled to the current sensor for connecting the receiver and transmitter to the loop in response to current flowing in the loop.

REFERENCES:
patent: Re16615 (1927-05-01), Hovland
patent: 1989621 (1935-01-01), Lesoine
patent: 2765366 (1956-10-01), Holden
patent: 4429183 (1984-01-01), Nemecsek
patent: 4821313 (1989-04-01), Grantland
patent: 4862494 (1989-08-01), Matheny
patent: 4922525 (1990-05-01), Dernovsek

Affiliated with

Also associated with

Rating

Pin fraud and shock prevention 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 Pin fraud and shock prevention system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pin fraud and shock prevention system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1032866