Patents by Inventor Neal M. Duval

Neal M. Duval 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).

  • Method of preventing filter media cracking when compressing two or more filter media layers
    Patent number: 8636151
    Abstract: The present disclosure generally relates to injection molded thermoplastic single filter media layer and multi-filter media layer filter cartridges that include a novel arrangement of structural features to improve both the quality of the manufacturing process and the integrity of the filter media layer seal and more particularly to a process for manufacturing both single filter media layer and multi-filter media layer filter cartridges and to the single filter media layer and the multi-filter media layer filter cartridges produced thereby and even more particularly to a process for manufacturing a multi-filter media layer filter cartridge without cracking the upper most filter media layer or any filter media layer during the compressing of at least two porous filter media layers between an inlet and an outlet while insuring an effective seal and the multi-filter media layer filter cartridges produced thereby and, yet, more particularly, to single filter media layer and the multi-filter media layer filter car
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: January 28, 2014
    Assignee: 3M Innovative Properties Company
    Inventors: Neal M. Duval, Gokhan Kuruc
  • PRESSURE RELIEF APPARATUS FOR HYDROPNEUMATIC VESSEL
    Publication number: 20130000735
    Abstract: An accumulator with a bladder or a diaphragm separating a gas chamber from an incompressible liquid chamber, the accumulator having a pressure relief valve to release gas from the gas chamber in case of overpressure; a device for filling and releasing the gas from the gas chamber.
    Type: Application
    Filed: March 18, 2011
    Publication date: January 3, 2013
    Inventors: Martin J. Blaze, Hemang R. Patel, Neal M. Duval
  • METHOD OF PREVENTING FILTER MEDIA CRACKING WHEN COMPRESSING TWO OR MORE FILTER MEDIA LAYERS
    Publication number: 20100044299
    Abstract: The present disclosure generally relates to injection molded thermoplastic single filter media layer and multi-filter media layer filter cartridges that include a novel arrangement of structural features to improve both the quality of the manufacturing process and the integrity of the filter media layer seal and more particularly to a process for manufacturing both single filter media layer and multi-filter media layer filter cartridges and to the single filter media layer and the multi-filter media layer filter cartridges produced thereby and even more particularly to a process for manufacturing a multi-filter media layer filter cartridge without cracking the upper most filter media layer or any filter media layer during the compressing of at least two porous filter media layers between an inlet and an outlet while insuring an effective seal and the multi-filter media layer filter cartridges produced thereby and, yet, more particularly, to single filter media layer and the multi-filter media layer filter car
    Type: Application
    Filed: September 19, 2007
    Publication date: February 25, 2010
    Inventors: Neal M. Duval, Gokhan Kuruc