Telephone-line powered coin telephone chassis
US5907606A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone-line powered coin telephone chassis which operates on as little as 23 milliamperes of off-hook loop current and which shuts down on-hook. Capacitors power a microprocessor for a short time during on-hook coin control immediately after a phone call. The chassis is designed to operate with the WESROC.RTM. coin telephone monitoring system and has built-in circuitry which makes a direct communications link between a remote unit of the WESROC system and the chassis. Connectors are built into the chassis for electrically connecting the chassis to the WESROC remote unit and to coin telephone components external to the chassis. Built into the chassis is circuitry for preventing tone fraud and pin fraud, detecting the presence of the handset, a push-button line diagnostic test, an interface for a volume switch and an interface for an electronic coin chute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.