Touch control identification system with portable encoder
Patent 4591854 Issued on May 27, 1986. Estimated Expiration Date: 
October 12, 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.
October 12, 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 3168737 3196440 3706008 Safety system Information communicating apparatus and method Efficient object identification system Switch activating system and method Capacitively coupled machine tool safety system having a digital quantizer Patent #: 4470046 InventorAssigneeApplicationNo. 06/541162 filed on 10/12/1983US Classes:340/5.65, Electronic coded record340/562, Capacitance340/825.23Machine toolExaminersPrimary: Yusko, Donald J.Attorney, Agent or FirmInternational ClassesG07C 9/00 (20060101)H04B 13/00 (20060101) B60R 25/00 (20060101) F16D 55/00 (20060101) Foreign Application Priority Data1982-10-12 GBAbstractA personnel identification system for controlling access to restricted equipment or restricted areas comprises a portable device such as a wrist watch (10) in which a unique digital identification code is stored, and a static control unit having a conductive touch element (12) and a code signal receiver (14) for comparing the identification code with a stored access code. The watch (10) includes a transmitter for transmitting the identification code as a modulated alternating signal by electrical conduction through the wearer's body to the touch element (12), so as to provide resistance to interfering radiated signals. The receiver includes a separate touch sensing circuit for sensing physical contact on the element (12) so that decoding circuitry in the receiver is activated only when contact is sensed thereby enhancing resistance to radiated signals and substantially ensuring that the identification code signal is received at sufficient strength, given the power restrictions of a battery operated portable device, for reliable detection and validation of the identification code. | |
