Patents by Inventor Leendert H. Staal

Leendert H. Staal 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).

  • Metal-oxide-silica adsorbent and process for refining oil using the same
    Patent number: 4956126
    Abstract: The invention provides a synthetic, calcined metal-oxide-silica adsorbent of which at least 40% of its surface area is contained in pores with radius of at least 2 nm. The invention further provides a process for refining oil, wherein the oil is treated with the absorbent as a bleaching solid. The adsorbent can be regenerated by calcination without substantial loss of activity.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: September 11, 1990
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Leendert H. Staal, Jan C. Vis, Jan W. Groeneweg
  • Metal-oxide-silica adsorbent for bleaching and refining oil
    Patent number: 4812436
    Abstract: The invention provides a synthetic, calcined metal-oxide-silica adsorbent of which at least 40% of its surface area is contained in pores with radius of at least 2 nm. The invention further provides a process for refining oil, wherein the oil is treated with the adsorbent as a bleaching solid. The adsorbent can be regenerated by calcination without substantial loss of activity.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: March 14, 1989
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Leendert H. Staal, Jan C. Vis, Jan W. Groeneweg
  • Catalyst suitable for hydrotreating
    Patent number: 4665048
    Abstract: The invention provides catalysts suitable for hydrotreatment of mineral oil which contain an oxide and/or sulphide derived from a metal of Group VI (B) and one from Group VIII metal and a transition alumina and which show an oxygen chemisorption above 185 micromoles per gram, preferably between 200 and 300. Preferably tha catalysts are free from anions of strong mineral acids.These catalysts can be prepared by impregnation of a transition alumina with an ammoniacal metal solution having an initial pH between 10.5 and 13, preferably between 11.0 and 12.5.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: May 12, 1987
    Assignee: Internationale Octrooi Matschappij "Octropa" B.V.
    Inventors: Willem A. Van Leeuwen, Eduard K. Poels, Leendert H. Staal, Dirk Verzijl