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| Number | Title | Issue Date |
| 5988509 | Refundable prepaid telephone card A prepaid transaction instrument, such as a prepaid telephone card, comprises an identification code for use by a consumer in gaining access to a prepaid telephone account associated with the identification code and a replacement code related to the ident... | 11/23/1999 |
| 5923734 | Methods and apparatus for providing a prepaid, remote memory transaction account with voice indicia An improved distributed system for effectuating commercial transactions by a consumer is provided. The system includes a service provider network or host system which comprises an account database of prepaid accounts and an audio library containing audio ... | 07/13/1999 |
| 5684291 | Refundable prepaid telephone card A prepaid transaction instrument, such as a prepaid telephone card, comprises an identification code for use by a consumer in gaining access to a prepaid telephone account associated with the identification code and a replacement code related to the ident... | 11/04/1997 |
| 5483445 | Automated billing consolidation system and method An automated system and method for consolidating a plurality of individual company charges for a customer with different periodic company billing and payment due dates is provided. Under the system, companies and businesses such as utility companies repor... | 01/09/1996 |
| 5422945 | Fast last digit detection of a dialed telephone number A method and system for efficiently recognizing the last digit of a computer-dialed DTMF telephone number. The actual gaps between a number of first-dialed successive digits are compared with a standard gap exhibited during computer dialing to determine w... | 06/06/1995 |
