Patents by Inventor Mark Hoag

Mark Hoag 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).

  • Hybrid bi-directional three color wave division multiplexer and method using same
    Patent number: 5712936
    Abstract: A hybrid, bi-directional, three-color, wave-division multiplexer (HB3-WDM), fiber optic communication system employs a combination of wide band and narrow band WDMs to multiplex three pairs of optic signals over two fiber optic cables. The three pairs of signals include two pairs in a range centered about 1550 nm and one pair in a range centered about 1330 nm. In one embodiment, modularized HB3-WDMs are used to modify a pre-existing, multi-cable, bi-directional, two-color WDM system. The modified system communicates thirty percent more data while maintaining pre-existing signal attenuation levels and pre-existing back-up capabilities.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: January 27, 1998
    Assignee: MCI Communications Corporation
    Inventors: Mark Hoag, David Keiser