Patent ID: 6714132
Filing Date: 2004-03-30
Classification: B60N,B60R,G08B

Abstract:
A system comprising:at least one detector for monitoring the presence of at least one object in a position; means, coupled to the at least one detector for transmitting one of a plurality of unique wireless signals to include a first signal when the at least one object is in the position and a second signal when the at least one object is moved from the position; and means, remotely located with respect to the transmitting means, for sensing each of said first signal and said second signal, the sensing means having a first timing function and a second timing function, said first timing function being enabled when the sensing means senses said first signal, said first timing function timing to a first time interval wherein, at the completion of each said first time interval, the sensing means (i) repeats said first timing function if said first signal is sensed, (ii) disables said first timing function if said second signal is sensed, and (iii) enables said second timing function if neither of said first signal and said second signal is sensed, said second timing function, if enabled, timing to a second time interval having a first time and ending at a second time that is later than said first time, the sensing means issuing a first alarm signal at said first time if neither of said first signal and said second signal is sensed thereat, the sensing means discontinuing said first alarm signal if said first signal is sensed during said second time interval, and the sensing means issuing a second alarm signal if said first signal is not sensed during said second time interval, said second alarm signal continuing after said second time until said second signal is sensed.