Patents by Inventor Wolgang Herrmann

Wolgang Herrmann 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).

  • Method for preparation of silica particles
    Patent number: 5256386
    Abstract: Silica particles which are substantially spherical, have a particle size of 1 to 100 .mu.m, a very narrow pore size distribution and a low alkali metal content. The particles can be prepared by sol-gel technique using emulsification technique for drop formation. The process comprises a sol growth step in a basic environment based on ammonium or amines and a post-treatment in such an environment. The silica particles are particularly suitable for use in chromatography as they have very good particle and porosity properties and high purity.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: October 26, 1993
    Assignee: Eka Nobel AB
    Inventors: Mats Nystrom, Wolgang Herrmann, Bernt Larsson