Conway Engineering, Inc.

Electrotel, Inc.

Mark E Stamos

Gary C Fields

Lawrence T Pena

A microprocessor controlled system for testing and selectively reconditioning a CRT in accordance with the Beltron process. The microprocessor monitors the function and filament voltage selection switches actuated by an operator. Once the filament voltage and functions have been specified, the microprocessor automatically controls the application of filament voltage, AC voltage and relatively high DC voltage to the CRT and displays the progress and results of the selected function. The system tests the emission characteristics of the cathode in each gun element, causes simultaneous cleaning of the cathode/grid elements by controlling the application of an AC voltage across each cathode/grid circuit while the filament voltage is at an elevated level, and restores those cathode/grid circuits requiring restoration by controlling the application of a relatively high DC voltage to each cathode/grid circuit in serial fashion for the several gun elements while maintaining the filament voltage at an elevated level. The system substantially reduces required operator interaction with the testing and reconditioning procedure and provides a commensurate reduction in the probability of destruction of a CRT by operator error.

Microprocessor controlled system for testing and selectively

A coin telephone message and management system is provided for use at a central office location of a telephone system with a plurality of conventional remotely located coin telephone stations and with, or in place of, an automated coin subsystem to which the coin telephone stations are otherwise connected by coin trunks. The coin telephone message and management system comprises a plurality of programmable line interface units each being connected to a said coin trunk for monitoring electrical signals present on the coin trunk indicative of usage of the station connected thereto, for delivering predetermined messages to a user of the station, and for generating electrical signals emulative of operation of the station for thereby controlling the automated coin subsystem; a message storage and delivery unit selectively connectable to the programmable line interface units for delivering at least one selectable audio message to the user of a said station via the coin trunk; and, a programmed system controller for coordinating operations of the programmable line interface units and the message storage and delivery unit for delivery of selected messages to the user of a said station, for responding to data entered by the user of a said station and for causing electrical signals emulative of operation of the station to be generated by the line interface unit.

Coin telephone message and management system

Apparatus for automatically obtaining data useful to determine accuracy of telephone toll message accounting equipment and procedures is disclosed. The apparatus is connected to plural telephone network lines of the telephone system at a central office location and simultaneously dials a plurality of predetermined long distance telephone numbers, each of which returns detectable information when successfully dialed up. The presence of the detectable information, such as test tone, is noted and the time is logged. This information is then automatically compared by a central control computer with the billing information collected by the billing computer to ascertain operational accuracy of the latter. The apparatus is automatically remotely operated by the central control computer under a predetermined protocol.

Telephone toll integrity checking system

An improved step-by-step switch assembly includes an electronic controller conversion module. A programmed microprocessor responds to incoming pulse trains of widely variant make and break ratios and generates precisely timed and shaped pulses to operate vertical, rotary and release magnets of the switch assembly. Other features include increased loop sensitivity, selective digit absorption and automatic periodic contact wiping to clean all of the contacts of the assembly.

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Oakland, CA, United States of America

Mark E Stamos