Patents by Inventor Josephus G. Sponselee

Josephus G. Sponselee 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).

  • Patent number: 4640807
    Abstract: Silica spheres are prepared in a process comprising:(a) preparing a silica hydrosol by mixing an aqueous solution of an alkali metal silicate with an aqueous solution of an acid;(b) converting the hydrosol into droplet form;(c) aging the droplets in a fluid to produce hydrogel particles;(d) partially drying the hydrogel particles at to C. in air having a relative humidity in the range of from 45 to 95%, to a water content in the range of from 0.3 to 1.3 kg/kg solids;(e) decreasing the cation content of the hydrogel particles by ion-exchange in an aqueous medium to less than 10% w, calculated on dry material; and(f) finally drying the hydrogel particles to obtain silica spheres.
    Type: Grant
    Filed: July 24, 1985
    Date of Patent: February 3, 1987
    Assignee: Shell Oil Company
    Inventors: Madjid Afghan, Josephus G. Sponselee