Patents by Inventor Dominick Marengo

Dominick Marengo 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).

  • Railroad signal system
    Patent number: 5178349
    Abstract: An improved railroad signal system is described in which a train is allowed to approach a block even if a red light is activated for the block. A white numbered light is activated indicating the maximum permissible speed of the train. The system includes a home clearing relay and a station timing relay which are activated by two separate circuits thereby eliminating a wire loop.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: January 12, 1993
    Assignee: Comstock Group, Inc.
    Inventor: Dominick Marengo