Patents by Inventor David J. Ruskauff

David J. Ruskauff 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).

  • Railway dark territory switch automation
    Patent number: 8857770
    Abstract: The invention provides a method for a railroad switch for use in un-signalized (dark) territory utilizing multiple audio messages for control and communication purposes to operate the railroad switch and relay its position to incoming trains. The messages are triggered by a programmable logic controller in conjunction with a dual tone multiple frequency signals.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: October 14, 2014
    Inventors: David J. Ruskauff, Donald Coy Beamon
  • Railway dark territory switch automation
    Publication number: 20100127134
    Abstract: The invention provides a railroad switch for use in un-signaled (dark) territory. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
    Type: Application
    Filed: November 10, 2008
    Publication date: May 27, 2010
    Inventors: David J. Ruskauff, Donald Coy Beaman