Patents by Inventor James W. Lafferty

James W. Lafferty 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).

  • Variable rate air spring apparatus for vehicle suspension
    Patent number: 4619467
    Abstract: An air spring apparatus for a vehicle suspension. An active air cylinder and piston of the apparatus are connected in series with the vehicle suspension. An inactive air cylinder constituting an air column extension of the active air cylinder is connected in series with the active air cylinder by an air conduit. The spring rate of the system is automatically adjustable to produce optimum isolation of impulsive forces and to maintain the forces on the road under dynamic conditions essentially equal to those forces under static conditions.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 28, 1986
    Inventor: James W. Lafferty