Identification system
Patent 4818855 Issued on April 4, 1989. Estimated Expiration Date: 
April 4, 2006. 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.
April 4, 2006. 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. 06/816873 filed on 01/07/1986US Classes:235/440, Multiple sensor235/449, Magnetic235/451, Capacitive235/492, Conductive340/10.34, Power up340/825.72Wireless linkExaminersPrimary: Trafton, David L.Attorney, Agent or FirmInternational ClassesG07C 9/00 (20060101)G06K 19/07 (20060101) G06K 7/00 (20060101) G06K 19/077 (20060101) G06K 7/08 (20060101) AbstractA remotely powered portable member having circuitry for storing and transmitting coded information. A first coupling device is provided for receiving a signal transmitted via one of a magnetic field and an electric field. A power circuit is connected to the first coupling device for deriving operating power from the received signal for use by the circuitry. A second coupling device is connected to the circuitry for transmitting coded information stored by the circuitry via the other one of the magnetic field and electric field. | |
