Patents by Inventor Jeffery S. Johnston

Jeffery S. Johnston 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).

  • Combination brake valve module
    Patent number: 5046786
    Abstract: A pressurized fluid control module is provided for a tractor-trailer brake system to effect the appropriate braking function.
    Type: Grant
    Filed: June 12, 1990
    Date of Patent: September 10, 1991
    Assignee: Midland Brake, Inc.
    Inventors: Jeffery S. Johnston, Michael G. Smith, Mark Karpinski
  • Compact, integrated, multi-function brake valve
    Patent number: 4915456
    Abstract: The compact, integrated, multi-function valve employed in semi-trailer brake systems having a plurality of pressurized air reservoirs comprise a plurality of internal passageways and ports communicating externally, a plurality of internal control means for interrupting or establishing fluid communication between the various internal passageways and a plurality of one-way means to ensure the integrity of the brake system in the event of leakage problems with one or the other of the pressurized air reservoirs. A preferred embodiment of the brake valve employs four sets of internal passageways and ports, two control means and two multi-function one-way means. As compared with the prior art, the improved brake valve protects the integrity of the brake system with less complexity, fewer components and the potential for enhanced reliability, reduced maintenance and overall lower costs.
    Type: Grant
    Filed: May 2, 1989
    Date of Patent: April 10, 1990
    Assignee: Midland Brake, Inc.
    Inventors: Dario Gross, Richard D. Hetfield, Jeffery S. Johnston