Assignee
SIGMA COMMUNICATIONS INC
US·3 granted patents·131 citations·filing 1999–2001
Technology mixH04M3
Top patents by PatentIndex Score
3 records- 0175US6678358B2Automated nodal calling systemSIGMA COMMUNICATIONS INC·Filed 2001·Granted Jan 13, 2004·26 cites·8 claims
- 0269US6567504B1Automated calling system with database updatingSIGMA COMMUNICATIONS INC·Filed 1999·Granted May 20, 2003·66 cites·20 claims
- 0361US6556664B1Public notification system and methodSIGMA COMMUNICATIONS INC·Filed 1999·Granted Apr 29, 2003·39 cites·20 claims
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