Burglar alarm
OwnerSang J. Choiinventor
Life of this patent
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Abstract
An alarm apparatus attached to an electronic device, activated by unplugging AC power cord of the apparatus device from a power outlet, irrespective to the states of the main switch and the device switch. If the power cord is unplugged from the outlet, it disconnects DC continuity component from the alarm circuit, breaks a voltage divider circuit, changes the voltage level high, and activates the alarm system. The DC continuity component could be either an external component, the power transformer winding, or a device power input DC impedance. Which element is utilized is determined by the position of the main switch and the device switch. The alarm system can be turned on either by remote control or by a local switch. The alarm system is battery powered for its own circuit operation and can be charged by a battery charger.
Claims12
A burglar alarm apparatus attached to an electronic or electrical device comprising:
- a) an alarm circuit and a power cord for plugging into an AC power outlet;
- said AC power outlet may include an AC power switch;
- b) said alarm circuit and said power cord connected to said burglar alarm;
- c) a DC continuity component connected external of, and electrically in parallel with said burglar alarm apparatus across a power outlet;
- d) a case for housing said burglar alarm apparatus;
- and
- e) a mounting means for securely attaching said burglar alarm apparatus to said electronic or electrical device wherein said burglar alarm apparatus is activated by unplugging, or shorting, or breaking said power cord, or activated by detaching said burglar alarm apparatus from said electronic or electrical device, irrespective of the state of a main AC power switch and/or an electronic device switch.
A method of activating an alarm apparatus including the steps of:
- a) securely attaching said alarm apparatus to an electronic device;
- b) connecting a power cord to said alarm apparatus and for plugging said power cord into an AC power outlet, said AC power outlet may include a main AC power switch;
- and
- c) connecting a DC continuity component electrically in parallel with and physically external to said alarm apparatus across a separate power outlet;
- whereby, unplugging, shorting, or breaking a power cord connected to said alarm apparatus will cause said activation of said alarm apparatus, irrespective of the position of a main AC power switch and/or of said electronic device switch.
Dependencies are inferred from the claim text.