Patents by Inventor David W. Hardwick

David W. Hardwick 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).

  • Optical transmission apparatus
    Patent number: 5069521
    Abstract: The apparatus comprises at least one standby optical fibre transmission path and at least one worker optical fibre transmission path. Each end of the paths is terminated by an associated transmit and receive electro-optic converters. The converters are connected to respective electrical protection switching devices. At least one optical switching means interfaces the electro-optic converters with the optical fibres at one end of the transmission paths and is arranged to switch the optical transmission between worker and standby fibres when a fault is detected.
    Type: Grant
    Filed: May 7, 1990
    Date of Patent: December 3, 1991
    Assignee: GEC Plessey Telecommunications Limited
    Inventor: David W. Hardwick