Sensory games
Patent 5082286 Issued on January 21, 1992. Estimated Expiration Date: 
September 6, 2010. 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.
September 6, 2010. 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 3683363 3843132 Magnetic chessboard with self-centering pieces Chess instruction apparatus Electronic chess game Translucent electronic board game with magnetic pawn Sensory games Patent #: 4981300 InventorsAssigneeApplicationNo. 578833 filed on 09/06/1990US Classes:273/238, Removable and discrete game piece changes status of circuit273/239MagneticExaminersPrimary: Grieb, William H.Attorney, Agent or FirmForeign Patent References
International ClassA63F 003/02Foreign Application Priority Data1989-09-07 GBAbstractElectronic game apparatus comprising a board displaying discrete playing areas and a number of playing pieces. Transmit and receive coils are provided beneath the surface of the board, preferably at right angles to each other, and each playing piece is provided in its base with an element. Means are provided for supplying a high-frequency current to each transmit coil in turn and for detecting the voltage induced in the receive coils for each discrete playing area. The presence of a playing piece on the playing area being tested, will affect the voltage induced in the receive coils and hence the presence, absence or type if desired, of a playing piece may be determined. The element preferably consists of any suitable metal or ferromagnetic material. Playing pieces of different types may be provided with elements of different materials. | |
