Fraud prevention in an electronic coin telephone set

US4625078A · kind A · utility

Assignees

• AT&T Technologies Incorporated · US
• AT&T Bell Laboratories · US

Inventors

• Paul E. Crouch · Freehold, US
• Joseph J. Nahas · Austin, US
• Howard Ng · Kingston, CA

Key dates

• Filing date: Dec 30, 1983
• Grant date: Nov 25, 1986
• Expiry date: Dec 30, 2003

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M17/023
• WIPO field: Control
• WIPO sector: Instruments

Abstract

This invention pertains to a microcomputer controlled coin telephone set which prevents coin call fraud and performs all of the coin discrimination functions. The microcomputer also checks the operational readiness of the telephone set to prevent the acceptance of coins into a hopper for late collection by a coin box unless or until the set is fully functional.