Inventor
SBISA DAN
US4 patents
Patents
4 patentsUS6847708B1Jan 25, 2005
Method and apparatus for validating pre-pay and post-pay communication services using the same integrated database
SPRINT COMMUNICATIONS CO64 citations93
US6535727B1Mar 18, 2003
Method and apparatus for providing pre-pay and post-pay communication services using the same integrated
SPRINT COMMUNICATIONS CO39 citations89
US6760418B1Jul 6, 2004
Method and apparatus for providing pre-pay and post-pay communication services using a switching system to monitor call duration
SPRINT COMMUNICATIONS CO15 citations81
US7415266B1Aug 19, 2008
Method and apparatus for providing pre-pay and post-pay communication services using the same integrated system
SPRINT COMMUNICATIONS CO0 citations49