Patents by Inventor Spielman R. Fred

Spielman R. Fred 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).

  • Multiple Car Elevator Safety System and Method
    Publication number: 20100206668
    Abstract: An elevator safety system (10) includes a limit switch (32) coupled to a first elevator car (14) and an actuator plate (30) coupled to a governor rope (24) of a second elevator car (16). The actuator plate trips (30) the limit switch (32) when a distance between the first elevator car (14) and the second elevator car (16) goes below a safety threshold distance to stop the first and second elevator cars (14, 16).
    Type: Application
    Filed: October 25, 2005
    Publication date: August 19, 2010
    Inventors: Kriss J. John, Fanion D. Loren, Spielman R. Fred, Greer R. Daniel