Patents by Inventor Petrus J. A. Tijm

Petrus J. A. Tijm 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).

  • Diesel fuel composition comprising dialkoxy alkanes for increased cetane number
    Patent number: 5858030
    Abstract: A diesel fuel composition is set forth for an increased cetane number vis-a-vis conventional diesel fuel compositions. The composition generally comprises one or more compounds selected from the dialkoxy alkane (DAAK) chemical family. In a preferred embodiment of the present invention, the diesel fuel composition consists of moderate amounts of dimethoxy propane (DMPP) and dimethoxy ethane (DMET) blended into a conventional diesel fuel.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: January 12, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Francis J. Waller, Edward L. Weist, Jr., Dennis M. Brown, Petrus J. A. Tijm
  • Filtration device
    Patent number: 5282877
    Abstract: A filtration apparatus is described wherein entrained solids are removed from particulate-carrying fluid by filtration under vigorous conditions with filter tubes. The filter apparatus comprises a plurality of tiers of filters, each tier comprising filter tubes supported on a tube sheet. The apparatus also contains a tiered conical sluicing system to concentrate and centralize the particulates. The solids discharge from the filter tubes and pass through the sluicing system to exit the apparatus through particulate outlet means. The use of the apparatus is characterized by a reduced re-entrainment of particulates in the fluid leaving the apparatus.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: February 1, 1994
    Assignee: Shell Oil Co.
    Inventors: Phillip E. Unger, Petrus J. A. Tijm, Hendrik A. Dirkse