Power and signal transmission system
March 17, 2012. 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 ReferencesPulse/direct current transmitting circuit in a key telephone system Battery feed circuit for subscriber line Active impedance line feed circuit Switching voltage regulator for an interface circuit in a telephone subscriber line Battery feed circuit Power supply for telephone exchange Terminating circuit in a battery feed circuit of an electronic exchange system Patent #: 4982422 InventorsApplicationNo. 852538 filed on 03/17/1992US Classes:379/412, Protective circuit379/413Power supply (e.g., battery feed)ExaminersPrimary: Dwyer, James L.Assistant: Smith, Creighton Attorney, Agent or FirmInternational ClassH04N 009/08Foreign Application Priority Data1991-03-19 JPAbstractA power and signal transmission system performs a transmission of a power from a first communication device to a second communication device via a transmission path as well as a transmission of a signal between the first and second communication devices via the transmission path. The first communication device includes a high voltage power source and a first pair of active inductances each having a low DC impedance and a high AC impedance, through which the power from the high voltage power source is supplied to the transmission path, and the second communication device includes a DC/DC converter and a second pair of active inductances each having a low DC impedance and a high AC impedance, through which the power transmitted via the transmission path is supplied. | |
