Patents by Inventor Siegfried Geigel

Siegfried Geigel 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 purifying hydrogen peroxide for microelectronics uses
    Patent number: 5232680
    Abstract: A method for further purifying previously distilled hydrogen peroxide for use in microelectronics in which a hydrogen peroxide starting solution purified initially by distillation is contacted, after the addition of a small amount of chelating agent, with a non-ion-exchanging polymeric adsorbent, such as a styrene-divinylbenzene copolymer, to obtain a highly purified hydrogen peroxide solution which satisfies the stringent purity requirements for use in producing 4-megabit and 16-megabit microprocessor chips.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: August 3, 1993
    Assignee: Peroxid-Chemie GmbH
    Inventors: Helmut Honig, Siegfried Geigel