Distributed control teleconferencing voice bridge
Patent 5113431 Issued on May 12, 1992. Estimated Expiration Date: 
October 31, 2009. 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 31, 2009. 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 ReferencesSemiconductor speech path switch Crosspoint switching system using control rings with fast token circulation Patent #: 4817082 InventorAssigneeApplicationNo. 429579 filed on 10/31/1989US Classes:379/93.14, Having switching station379/93.05, Terminal interface circuitry379/203.01, Operator control379/205.01, Conferencing initiation by single calling station379/291With detail of crosspoint switching structure (e.g., crossbar)ExaminersPrimary: Dwyer, James L.Assistant: Woo, Stella Attorney, Agent or FirmInternational ClassH04M 011/00AbstractAn arrangement for teleconferencing voice and data is provided through an arrangement that includes a voice bridge that offers individual control of the conferencing setup. The voice bridge comprises a crossbar with crosspoints that include a series connection of two switches and a resistor. One switch of each crosspoint is associated with the row of the crosspoint while the other switch of the crosspoint is associated with the column of the crosspoint. A user, connected to a selected row and column of the crossbar for the "talk" and "listen" functions, respectively, controls the row switches in the crosspoints connected to the user's row and the column switches in the crosspoints connected to the user's column.Other References
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