Patents by Inventor Ronald L. Hartog

Ronald L. Hartog 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).

  • Convertible liquid filter
    Patent number: 4610787
    Abstract: An insert carrying cartridge filtering element for use in converting a liquid filter from a bag-type filter where fluid entering the filter flows into a bag and is strained through the bag to a cartridge-type filter where fluid entering the filter passes through the cartridge filtering element and exits the filter.
    Type: Grant
    Filed: September 25, 1984
    Date of Patent: September 9, 1986
    Assignee: Filter Specialists, Inc.
    Inventors: Howard W. Morgan, Ronald L. Hartog