Number | Name | Date | Kind |
---|---|---|---|
4788719 | Gupta | Nov 1988 | |
4791640 | Sand | Dec 1988 | |
4935956 | Hellwarth et al. | Jun 1990 | |
5003584 | Benyacar et al. | Mar 1991 | |
5023868 | Davidson et al. | Jun 1991 | |
5103475 | Shuen | Apr 1992 | |
5109401 | Hattori et al. | Apr 1992 | |
5146491 | Silver et al. | Sep 1992 | |
5148474 | Haralambopoulos et al. | Sep 1992 | |
5179584 | Tsumura | Jan 1993 | |
5218632 | Cool | Jun 1993 | |
5222125 | Creswell et al. | Jun 1993 |
Entry |
---|
Ser. No.: 07/629,912 U.S. patent application filed on Dec. 19, 1990 and allowed on Sep. 11, 1992 to N. V. Chau et al., Title: Method and Apparatus for the Billing of Value-Added Communication Calls. |