Patents by Inventor Fred C. Stevens

Fred C. Stevens 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).

  • Controlled wheel braking system
    Patent number: 4441589
    Abstract: A controlled wheel braking system for vehicles wherein fluid pressure on the wheel brake cylinder is relieved at the moment of wheel lock up so as to prohibit skidding and at the same time optimize the braking of the vehicle. The system includes a control valve positioned in the brake fluid line between the master cylinder and the wheel brake cylinder which is responsive to imminent wheel lock up. The control valve senses wheel lock up and upon sensing bleeds brake fluid from the wheel brake cylinder to unlock the wheel thereby preventing skidding. Upon sensing the unlocking of the wheel the bled brake fluid is again fed to the wheel brake cylinder to optimize the braking of the vehicle. If the wheel again locks up the cycle is repeated thereby providing a pumping action on the brakes.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: April 10, 1984
    Inventor: Fred C. Stevens
  • Controlled wheel braking system
    Patent number: 4265343
    Abstract: A controlled wheel braking system for vehicles wherein fluid pressure on the wheel brake cylinder is relieved at the moment of wheel lock up so as to prohibit skidding and at the same time optimize the braking of the vehicle. The system includes a control valve positioned in the brake fluid line between the master cylinder and the wheel brake cylinder which is responsive to imminent wheel lock up. The control valve senses wheel lock up and upon sensing bleeds brake fluid from the wheel brake cylinder thereby preventing skidding.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: May 5, 1981
    Inventor: Fred C. Stevens