Patents by Inventor Willem Taede Hulshof

Willem Taede Hulshof 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).

  • Precipitated silica particles for cat litter
    Patent number: 7037475
    Abstract: The invention pertains to precipitated silica particles having edged surfaces and a length: width: depth ratio of 1:1:1 to 3:3–1:1 with the length being 0.25 to 15 mm, an absorbing capacity PV water (wt. % >;125, a pore volume PV Hg (ml/g) 0.8–4, a pore volume PV N2 (ml/g) 0.2–1.5, a bulk density BD (g/l) 200–500, and preferably a pH<8, for use as a cat liter.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: May 2, 2006
    Assignee: Grace GmbH & Co. KG
    Inventors: Willem Hendrik Dokter, Willem Taede Hulshof, Nicolaas H. M. Leliveld, Jürgen Koltzer
  • Precipitated silica particles for cat litter
    Publication number: 20040146444
    Abstract: The invention pertains to precipitated silica particles having edged surfaces and a length: width: depth ratio of 1:1:1 to 3:3-1:1 with the length being 0.25 to 15 mm, an absorbing capacity PV water (wt. % >;125, a pore volume PV Hg (ml/g) 0.8-4, a pore volume PV N2 (ml/g) 0.2-1.5, a bulk density BD (g/l) 200-500, and preferably a pH<8, for use as a cat liter.
    Type: Application
    Filed: February 5, 2004
    Publication date: July 29, 2004
    Inventors: Willem Hendrik Dokter, Willem Taede Hulshof, Nicolaas H.M. Leliveld, Jurgen Koltzer