Security system and method for a portable personal computer

• US 5,578,991 A
• Filed: 12/02/1994
• Issued: 11/26/1996
• Est. Priority Date: 12/02/1994
• Status: Expired due to Term

• Current Assignee: Dell USA LP (Dell Technologies Inc.)
• Original Assignee: Dell USA LP (Dell Technologies Inc.)
• Inventors: Scholder, Erica J.
• Primary Examiner(s): SWANN III, GLEN R
• Application Number:
  US08/348,387
• Time in Patent Office: 725 Days
• Field of Search: 340/571, 340/568, 340/653, 340/666, 340/691, 340/692
• US Class Current: 340/571
• CPC Class Codes: G06F 21/35 communicating wirelessly
• CPC Class Codes: G06F 21/88 Detecting or preventing theft or loss
• CPC Class Codes: G08B 13/1409 for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector

Abstract

The system includes (1) a sensor for detecting a separation of the portable computer from an object, the sensor transitioning from an inactivated state to an activated state when the portable computer is separated and (2) an alarm circuit coupled to the sensor and having a disarmed state and an armed state, the alarm circuit detecting when the sensor is in the activated state and issuing a notification when the alarm circuit is in the armed state and the sensor is in the activated state.

Claims

1. A security system for a portable computer, said portable computer having general purpose data processing and storage circuitry, said security system comprising:

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

an alarm circuit integrated in said general purpose data processing and storage circuitry and coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state; and

a computer input device for providing data to said general purpose data processing and storage circuitry to selectively place said alarm circuit in said armed state and said disarmed state.

2. The system as recited in claim 1 wherein said sensor comprises a movable plunger portion contactible with said object when said portable computer is separated less than a predetermined distance from said object.

3. The system as recited in claim 1 wherein said object is a supporting surface underlying said portable computer, said sensor transitioning from said inactivated state to said activated state when said portable computer is separated from said supporting surface, said sensor being a momentary switch.

4. The system as recited in claim 1 wherein said input device is selected from the group consisting of a keyboard, a mouse, a stylus pin or voice recognition device, said input device allowing a user to place said alarm circuit in a disarmed state, by providing a password from said user via said input device of said portable computer.

5. The system as recited in claim 1 wherein said notification is selected from the group consisting of:

an audible alarm; and

a visual alarm.

6. A security system for a portable computer, comprising:

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

an alarm circuit coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state; and

timer means for placing said alarm circuit in said armed state upon expiration of a predetermined period of time of data input inactivity.

7. A security system for a portable computer, comprising:

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated, said portable computer comprising a motherboard having data processing and storage circuitry located thereon, said sensor located on said motherboard and extending through an outer case of said portable computer; and

an alarm circuit coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state.

8. A security system for a portable computer, comprising:

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated, said portable computer comprising an outer case having a plurality of compliant feet mounted thereon, said feet providing support for said portable computer, said sensor embodied in one of said plurality of feet; and

an alarm circuit coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state.

9. A method of providing security for a portable computer, comprising the steps of:

detecting a separation of said portable computer from an object with a sensor, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

issuing a notification with an alarm circuit coupled to said sensor, said step of issuing comprises the step of issuing said notification with general purpose data processing and storage circuitry, said general purpose data processing and storage circuitry forming a portion of said alarm circuit, said alarm circuit having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state, said alarm circuit issuing said notification when said alarm circuit is in said armed state and said sensor is in said activated state; and

providing data to said general purpose data processing and storage circuitry via a computer input device to selectively place the alarm circuit in said armed state and said disarmed state.

10. The method as recited in claim 9 wherein said step of detecting comprises the step of displacing a movable plunger portion of said sensor, said movable plunger portion contactible with said object when said portable computer is separated less than a predetermined distance from said object.

11. The method as recited in claim 9 wherein said object is a supporting surface underlying said portable computer, said sensor is a momentary switch and said step of detecting comprises the step of transitioning from said inactivated state to said activated state when said portable computer is separated from said supporting surface.

12. The method as recited in claim 9 wherein said step of providing data includes the step of providing a password to said general purpose data processing and storage circuitry via an input device selected from the group consisting of a keyboard, a mouse, stylus and voice recognition device, thereby allowing a user to place said alarm circuit in a disarmed state.

13. The method as recited in claim 9 wherein said step of issuing comprises the step of issuing a notification selected from the group consisting of:

an audible alarm; and

a visual alarm.

14. A method of providing security for a portable computer, comprising the steps of:

detecting a separation of said portable computer from an object with a sensor, said sensor transitioning from an inactivated state to an activated stated when said portable computer is separated;

issuing a notification with an alarm circuit coupled to said sensor, said alarm circuit having a disarmed state and an armed stated, said alarm circuit detecting when said sensor is in said activated state, said alarm circuit issuing said notification when said alarm circuit is in said armed state and said sensor is in said activated state; and

placing said alarm circuit in said armed state with timer means upon expiration of a predetermined period of time of data input inactivity.

15. A method of providing security for a portable computer, comprising the steps of:

detecting a separation of said portable computer from an object with a sensor, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated, said portable computer comprising a motherboard having data processing and storage circuitry located thereon and said step of detecting comprises the step of detecting said movement with a sensor located on said motherboard and extending through an outer case of said portable computer; and

issuing a notification with an alarm circuit coupled to said sensor, said alarm circuit having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state, said alarm circuit issuing said notification when said alarm circuit is in said armed state and said sensor is in said activated state.

16. A method of providing security for a portable computer, comprising the steps of:

detecting a separation of said portable computer from an object with a sensor, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated, said portable computer comprising an outer case having a plurality of compliant feet mounted thereon, said feet providing support for said portable computer and said step of detecting comprises the step of detecting said movement with a sensor embodied in one of said plurality of feet; and

issuing a notification with an alarm circuit coupled to said sensor, said alarm circuit having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state, said alarm circuit issuing said notification when said alarm circuit is in said armed state and said sensor is in said activated state.

17. A portable computer, comprising:

a housing;

general purpose data processing and storage circuitry contained within said housing;

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

an alarm circuit coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state, said alarm circuit integrated with said general purpose data processing and storage circuitry; and

a computer input device for providing data to said general purpose data processing and storage circuitry to selectively place the alarm circuit in said armed stated and said disarmed state.

18. The computer as recited in claim 17 wherein said sensor comprises a movable plunger portion contactible with said object when said portable computer is separated less than a predetermined distance from said object.

19. The computer as recited in claim 17 wherein said object is a supporting surface underlying said portable computer, said sensor transitioning from said inactivated state to said activated state when said portable computer is separated from said supporting surface, said sensor being a momentary switch.

20. The computer as recited in claim 17 wherein said portable computer comprises a motherboard having said data processing and storage circuitry located thereon, said sensor located on said motherboard and extending through an outer case of said portable computer.

21. The computer as recited in claim 17 wherein said notification is selected from the group consisting of:

an audible alarm; and

a visual alarm.

22. The computer as recited in claim 17 wherein said notification is an audible alarm selected from the group consisting of:

a generated tone; and

a spoken message.

23. The computer as recited in claim 17 further comprising a display screen coupled to said data processing and storage circuitry, said alarm circuit adapted to display a warning message on said display screen when said alarm circuit is in said armed state.

24. A security system for a portable computer, comprising:

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

an alarm circuit coupled to said sensor and having a disarmed state and an armed state, said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state; and

timer means for placing said alarm circuit in said armed state upon expiration of a predetermined period of time of data input inactivity.

25. A portable computer, comprising:

a housing;

general purpose data processing and storage circuitry contained within said housing;

a sensor for detecting a separation of said portable computer from an object, said sensor transitioning from an inactivated state to an activated state when said portable computer is separated;

an alarm circuit coupled to said sensor and having a disarmed state and an armed state,

said alarm circuit detecting when said sensor is in said activated state and issuing a notification when said alarm circuit is in said armed state and said sensor is in said activated state, said general purpose data processing and storage circuitry forming a portion of said alarm circuit;

arming means for allowing a user to place said alarm circuit in said armed state; and

disarming means for allowing said user to place said alarm circuit in said disarmed state, said disarming means requiring entry of a password from said user via an input device coupled to said data processing and storage circuitry of said portable computer, said portable computer further including an outer case having a plurality of compliant feet mounted thereon, said feet providing support for said portable computer, said sensor embodied in one of said plurality of feet.