Method and apparatus for touch-activated identification and information transfer
October 19, 2019. 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 3696409 Capacitive touch switch array Single-electrode capacitance touchpad sensor systems Touch sensitive control device Capacitance-variation-sensitive touch sensing array system Keyless entry system Switch device with operating modes of capacitive proximity and mechanical actuation Capacitively coupled identity verification and escort memory apparatus Chip card capable of both contact and contactless operation including a contact block Method and apparatus for transbody transmission of power and information Patent #: 6211799 InventorsApplicationNo. 09/420829 filed on 10/19/1999US Classes:340/10.1, Interrogation response200/600, CAPACITIVE SWITCH340/10.51, Programming (e.g., read/write)340/562, Capacitance340/825.72, Wireless link341/33Capacitive actuationExaminersPrimary: Crosland, Donnie L.Attorney, Agent or FirmInternational ClassG06K 19/07 (20060101)AbstractPhysical structures respond to proximity or touch, conveying to a reader information such as the identity of the structure or some data associated therewith. In its simplest form, the structure comprises an electrical load and a pair of electrodes connected thereto. The electrodes are spaced apart (by air or other dielectric medium). A signal generator, which acts as a "reader," is connected to a larger electrode that may be embedded in an environmental surface. When the structure is placed in proximity to the reader electrode, application of the signal results in capacitive coupling between the reader and the electrodes of the structure. The structure is not detected by the reader, however, because the capacitive coupling is comparable for both electrodes, so the load experiences only a small electrical gradient. But if one of the electrodes is grounded, this symmetry is broken and current is drawn through the load. In general, grounding occurs when a person, coupled (even weakly) to environmental ground--e.g., by virtue of standing on the floor--touches one of the electrodes. The resulting loading, which may be varied over time by the structure, is detected by the signal generator.Other References
| |
