Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-08-28
2000-10-24
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340571, 3405729, 70277, 361172, 439306, G08B 1314
Patent
active
061374091
ABSTRACT:
A computer anti-theft system that includes a remote transmitter unit carried by the user, a dongle that physically attaches and selectively locks onto the parallel port on an existing computer, and a software program that is loaded into the computer's memory. When the system is activated, the remote transmitter unit transmits a pulse code signal which is received by a receiver component located inside the dongle. When the pulse code signal is received, the dongle is elevated to an active state. The dongle then transmits a return pulse code signal to the remote transmitter unit and the loop continues. If no pulse code signal is received, the dongle, is elevated to an alarm state. An alarm pulse code signal is then broadcast to the remote transmitter unit and elevating it to an alarm state. In one embodiment, the software program is used to control a solenoid inside the dongle which prevents removal of the dongle from the parallel port. The dongle and remote transmitter are electrically self contained thereby enabling the computer to be turned-off.
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Craine Dean A.
Mullen Thomas
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