US Patent 9071643 Personal security system

A personal security system takes advantage of location determination capabilities of a mobile communication services to provide personal security features to one or more communities of users. One method includes a user initiating a security period from a mobile device and specifying an end condition for that security period. If the user does not terminate the security period, at the end of the security period a notification is sent with information characterizing the user and a location associated with the user.