Patents by Inventor Jan C. Vis

Jan C. Vis 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