Safety system
Patent 3939679 Issued on February 24, 1976. Estimated Expiration Date: 
February 24, 1993. 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.
February 24, 1993. 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 ReferencesInventorsAssigneeApplicationNo. 451975 filed on 03/18/1974US Classes:70/277, Electrical type (e.g., solenoid)341/181, Carrier frequency variation42/70.01, SAFETY MECHANISM42/70.11Firearm lockExaminersPrimary: Pendegrass, Verlin R.Assistant: Jordan, C. T. Attorney, Agent or FirmAbstractNormally disabled electrical and mechanical devices are caused to be enabled to operate by remote control signals having predetermined distinctive characteristics, such signals originating from enabling control equipment transported by an authorized person or persons. Receiving equipment providing output enabling signals only in response to received signals having the predetermined distinctive characteristics is preferably made integral with the mechanical or electrical devices involved and is coupled through appropriate electronic or electromechanical devices to the disabling means in the mechanical or electrical devices to be enabled. | |
