A system for sending an effective warning signal to receivers in a predetermined area. A transmitter, activated by a local authority, sends a severe weather warning signal to a plurality of receivers. Cities or counties within the predetermined area are divided into subdivisions thereof called sectors,...http://www.google.fr/patents/US20020075155?utm_source=gb-gplus-shareBrevet US20020075155 - System for selective notification of severe weather events
System for selective notification of severe weather events
Numéro de demande: 09/804,772 Numéro de publication: US 2002/0075155 A1 Date de dépôt: 13 mars 2001 Brevet délivré: US7049971 ( Date de délivrance 23 mai 2006)
