Patents Assigned to Johnson Brothers Precision Precast Products, Inc.
  • Apparatus for manufacturing precast concrete articles
    Patent number: 5143344
    Abstract: A system for molding concrete articles such as paving stones, including a rack having opposing first and second vertical walls that have corresponding rails, and trays that include article molds adapted to receive concrete for curing, the trays being sized and constructed to slide on the rails.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: September 1, 1992
    Assignee: Johnson Brothers Precision Precast Products, Inc
    Inventors: David L. Johnson, Robert A. Johnson
  • Method of manufacturing precast concrete articles
    Patent number: 5096648
    Abstract: A method for producing concrete paving stones includes slidably mounting paving stone molds in a vertical row in a rack; sliding one mold to a different depth in the rack; filling the mold with concrete; sliding the mold to its original position; and filling the other molds in a similar manner.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: March 17, 1992
    Assignee: Johnson Brothers Precision Precast Products, Inc.
    Inventors: David L. Johnson, Robert A. Johnson