Method of testing a security and a security for carrying out this method
Patent 4609207 Issued on September 2, 1986. Estimated Expiration Date: 
January 9, 2005. 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.
January 9, 2005. 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 964014 2968799 3173291 3422269 3471172 3652862 3783249 3873813 Documents of value printed to prevent counterfeiting Ferromagnetic marker pairs for detecting objects having marker secured thereto, and method and system for activating, deactivating and using same InventorsAssigneeApplicationNo. 06/690375 filed on 01/09/1985US Classes:283/70, Identifying235/493, Magnetic283/74, Identifier283/82, In incorporated magnetic material283/83, And electrically conductive material283/85, Utilizing electromagnetic radiation283/91Specific spectral transmittance or reflectanceExaminersPrimary: Spruill, Robert L.Assistant: Ross, Taylor J. Attorney, Agent or FirmInternational ClassesG07D 7/12 (20060101)G07D 7/00 (20060101) G07D 7/04 (20060101) D21H 21/48 (20060101) D21H 21/40 (20060101) Foreign Application Priority Data1979-06-22 DEAbstractA method of testing a security having a mechanically testable identifying mark, for example a security thread, which has a physical property, for example electric conductivity, which can be measured without contact by means of a first field, for example, an electric field. The physical property can be reproducibly influenced by the effect of a second field, for example an electromagnetic field. If this influence takes place periodically, a signal is produced as a measured variable modulated according to the mutual effect of the two fields. | |
