Patents by Inventor Joseph L. Cristaldi

Joseph L. Cristaldi 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).

  • Underdrain for a filter system for filtering water or wastewater
    Patent number: 9072989
    Abstract: An apparatus for use in a filter system for filtering water or wastewater. The apparatus includes at least one underdrain lateral. The at least one underdrain lateral has at least an inner chamber, a first outer chamber and a second outer chamber. The first outer chamber and the second outer chamber are preferably in fluid communication with the inner chamber. The inner chamber, the first outer chamber and the second outer chamber are preferably formed by an inner liner and an outer liner. The outer liner is a separate piece from the inner liner and surrounds the inner liner. The inner chamber is preferably configured to simultaneously receive a liquid and a gas during a washing procedure including simultaneous use of a liquid and gas to clean a filter bed to create a liquid and gas interface in the inner chamber.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: July 7, 2015
    Assignee: Roberts Marketing DE, Inc.
    Inventors: R. Lee Roberts, Troy A. Jackson, Joseph L. Cristaldi
  • Underdrain for a filter system for filtering water or wastewater and a method of washing the filter system
    Publication number: 20130306542
    Abstract: An apparatus for use in a filter system for filtering water or wastewater. The apparatus includes at least one underdrain lateral. The at least one underdrain lateral has at least an inner chamber, a first outer chamber and a second outer chamber. The first outer chamber and the second outer chamber are preferably in fluid communication with the inner chamber. The inner chamber, the first outer chamber and the second outer chamber are preferably formed by an inner liner and an outer liner. The outer liner is a separate piece from the inner liner and surrounds the inner liner. The inner chamber is preferably configured to simultaneously receive a liquid and a gas during a washing procedure including simultaneous use of a liquid and gas to clean a filter bed to create a liquid and gas interface in the inner chamber.
    Type: Application
    Filed: May 21, 2012
    Publication date: November 21, 2013
    Inventors: R. Lee Roberts, Troy A. Jackson, Joseph L. Cristaldi