Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
Patent 4494114 Issued on January 15, 1985. Estimated Expiration Date: 
December 5, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 5, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2843843 3656114 3815088 Sequential coded computerized anti-theft lock Calculator theft prevention device Portable calculator incorporating an anti-theft feature Calculator system with anti-theft feature Security system Appliance anti-theft and protection circuitry Apparatus control system InventorAssigneeApplicationNo. 06/558115 filed on 12/05/1983US Classes:340/5.31, Lockout or disable340/426.28, Door or lock340/426.34, Accessory (e.g., speaker, radio face plate, etc.)340/571Alarm on protected articleExaminersPrimary: Shaw, Gareth D.Assistant: Dorsey, Dennis L. Attorney, Agent or FirmInternational ClassesG07C 9/00 (20060101)G07C 9/00 (20060101) G06F 21/00 (20060101) G06F 21/00 (20060101) G08B 13/00 (20060101) G08B 13/00 (20060101) G08B 13/14 (20060101) G08B 13/14 (20060101) AbstractA lock-out security arrangement for and method of maintaining microprocessor-controlled electronic equipment normally operational until the occurrence of a disabling event, such as physical removal of the equipment from its normal installation, and/or electrical removal of the equipment from a source of electrical power, and thereupon for disabling the equipment after detecting the disabling event and for maintaining the equipment disabled, even after the disabling event has been discontinued, until a code manually entered via a keyboard associated with a microprocessor for controlling the normal operation of the equipment matches a private access code whose identity is protected from external interrogation by reason of being stored in an internal non-volatile memory of the microprocessor. The private access code is preferably selected by and known only to the user, and may be changed to a different private access code at the user's option.Other References
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