Patents by Inventor William Clay Ratliff

William Clay Ratliff 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).

  • Airport bridge and lift
    Patent number: 6928684
    Abstract: A lift is coupled to the outer cab or rotunda of a telescoping bridge. The lift has a carriage that can be moved by a cable and a motor upward or downward and which includes a platform that has sensing means for controlling the motor for stopping downward movement of the carriage when it engages the ground. An electrically operated safety catch is provided to prevent the carriage form falling in the event the cable breaks. A safety system is provided which prevents the bridge from moving if the carriage is not in the up position and its door is not closed.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: August 16, 2005
    Assignee: JetBridge Technology, Inc.
    Inventors: William Clay Ratliff, Fredrick Charles Keish, Jr.
  • Airport bridge and lift
    Publication number: 20040143916
    Abstract: A lift is coupled to the outer cab or rotunda of a telescoping bridge. The lift has a carriage that can be moved by a cable and a motor upward or downward and which includes a platform that has sensing means for controlling the motor for stopping downward movement of the carriage when it engages the ground. An electrically operated safety catch is provided to prevent the carriage form falling in the event the cable breaks. A safety system is provided which prevents the bridge from moving if the carriage is not in the up position and its door is not closed.
    Type: Application
    Filed: October 9, 2003
    Publication date: July 29, 2004
    Inventors: William Clay Ratliff, Fredrick Charles Keish
  • Airport bridge and lift
    Patent number: 6658685
    Abstract: A lift is coupled to the outer cab of a telescoping bridge. The lift has a carriage that can be moved by a cable and a motor upward or downward and which includes a platform that has sensing means for controlling the motor for stopping downward movement of the carriage when it engages the ground. An electrically operated safety catch is provided to prevent the carriage from falling in the event the cable breaks. A safety system is provided which prevents the bridge from moving if the carriage is not in the up position and its door is not closed.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: December 9, 2003
    Inventors: William Clay Ratliff, Fredrick Keish, James Angel, William Dorrough
  • Airport bridge and lift
    Patent number: RE39063
    Abstract: A lift is coupled to the outer cab of a telescoping bridge. The lift has a carriage that can be moved by a cable and a motor upward or downward and which includes a platform that has sensing means for controlling the motor for stopping downward movement of the carriage when it engages the ground. An electrically operated safety catch is provided to prevent the carriage from falling in the event the cable breaks. A safety system is provided which prevents the bridge from moving if the carriage is not in the up position and its door is not closed.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: April 18, 2006
    Inventors: William Clay Ratliff, Frederick C. Keish