Patents by Inventor Ian William Lewis

Ian William Lewis 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).

  • Vehicle steering system
    Patent number: 6854539
    Abstract: A land vehicle has four wheels (10) by which the vehicle is driven and steered and the wheels are driven by hydraulic motors (11). In one arrangement the vehicle is steered by at least one pair of steerable wheels and supply of fluid to the motors is arranged to reduce the speed of a wheel or wheels at one side of the vehicle during turning. The vehicle can also be operated in the skid steer mode with the wheels locked in a straight ahead position.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: February 15, 2005
    Assignee: Lewis Equipment Limited
    Inventor: Ian William Lewis
  • Vehicle steering system
    Publication number: 20040066009
    Abstract: A land vehicle has four wheels (10) by which the vehicle is driven and steered and the wheels are driven by hydraulic motors (11). In one arrangement the vehicle is steered by at least one pair of steerable wheels and supply of fluid to the motors is arranged to reduce the speed of a wheel or wheels at one side of the vehicle during turning. The vehicle can also be operated in the skid steer mode with the wheels locked in a straight ahead position.
    Type: Application
    Filed: August 21, 2003
    Publication date: April 8, 2004
    Inventor: Ian William Lewis