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"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 5818125 | Secondary source of energy system for powering communications hardware and services and associated method A system for providing backup power for a communications system is disclosed. The backup power system of the present invention includes a device for supplying capacitively stored power and a device for monitoring a power level in the communications system... | 10/06/1998 |
| 5761638 | Telephone network apparatus and method using echo delay and attenuation The present invention provides a telephone network apparatus for performing speech recognition services in a telephone system in substantially real time. The apparatus uses a telephone channel signal to determine the echo delay of a telephone channel and ... | 06/02/1998 |
| 5757899 | Call screening using subscriber specified timers and schedules A call screening service and system are disclosed for a telephone switching network. The call screening service provides a service subscriber with a number of call screening features that are subscriber setable via an automated call screening configuratio... | 05/26/1998 |
