Patents by Inventor Carmelo Laface

Carmelo Laface has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Discriminating network for telephone switching signals
    Patent number: 4115664
    Abstract: A network discriminating among switching signals appearing on a pair of talking wires of a telephone line comprises a light-emitting diode in series with each wire and a phototransistor illuminable thereby. The phototransistors energize respective amplifiers which work into a logic circuit distinguishing between current flow in one or both of these wires.
    Type: Grant
    Filed: April 5, 1977
    Date of Patent: September 19, 1978
    Assignee: Societa Italiana Telecomunicazioni Siemens S.p.A.
    Inventors: Carmelo Laface, Carlo Vantellini