Patents by Inventor Mark J. Albertson

Mark J. Albertson 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).

  • Fail-safe wheel service brake system
    Patent number: 5050939
    Abstract: A hydraulic wheel braking system for a vehicle includes wet disc wheel brakes that are applied by a single spring-activated piston within each brake housing. Each piston is selectively and variably disengaged from the brake discs by variable hydraulic pressure acting against the piston in opposition to spring pressure to enable controlled wheel rotation. During vehicle operation, brake fluid pressure at the pistons is controlled by a foot pedal-operated brake valve. A manually-operated parking and control valve assembly can selectively disable the brake valve and relieve hydraulic pressure at the pistons to spring-apply the pistons to the discs. The assembly acts to automatically spring-apply the pistons to the discs upon a loss of brake or transmission clutch fluid pressure.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: September 24, 1991
    Assignee: Atlas Copco Construction and Mining Technique AB
    Inventors: Paul J. Middelhoven, Mark J. Albertson, Eric Johnson
  • Fail-safe wheel service brake system
    Patent number: 4893879
    Abstract: A hydraulic wheel braking system for a vehicle includes wet disc wheel brakes that are applied by a single spring-activated piston within each brake housing. Each piston is selectively and variably disengaged from the brake discs by variable hydraulic pressure acting against the piston in opposition to spring pressure to enable controlled wheel rotation. During vehicle operation, brake fluid pressure at the pistons is controlled by a foot pedal-operated brake valve. A manually-operated parking and control valve assembly can selectively disable the brake valve and relieve hydraulic pressure at the pistons to spring-apply the pistons to the discs. The assembly acts to automatically spring-apply the pistons to the discs uopn a loss of brake or transmission clutch fluid pressure.
    Type: Grant
    Filed: February 12, 1988
    Date of Patent: January 16, 1990
    Inventors: Paul J. Middelhoven, Mark J. Albertson, Eric Johnson