Patents by Inventor Werner Büttner

Werner Büttner 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 the purification of corrosive gases
    Patent number: 7108737
    Abstract: The present invention relates to a novel process for the preparation of high-purity chemicals with an extremely low particle count, such as ammonia gas, hydrogen fluoride and hydrogen chloride, which are also used as aqueous solutions in semiconductor technology the corrosive gas is enriched with an absorbent which is miscible with the gas and in which impurities present in the gas are soluble, and the gas is subsequently subjected to membrane filtration.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: September 19, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Ewald Neumann, Wolfgang Himmler, Werner Büttner, Harald Fritsch, Hans-Jürgen Schmidt, Martin Hostalek
  • Method for producing high-purity hydrochloric acid
    Patent number: 6793905
    Abstract: This invention relates to a novel method, which can be carried out according to industrial standards, for producing high-purity hydrochloric acid with a very low particle content, for use in the production of semiconductors.
    Type: Grant
    Filed: April 8, 2002
    Date of Patent: September 21, 2004
    Assignee: Merck Patent GmbH
    Inventors: Werner Büttner, Martin Hostalek, Ching-Jung Kan, Chih-Peng Lu
  • Method for producing high-purity sulphuric acid
    Patent number: 6740302
    Abstract: The invention relates to a novel method for producing high-purity sulfuric acid for use in the semiconductor industry. The method comprises the addition of a hydrogen peroxide solution to an engineered oelum in order to reduce the SO2 concentration, evaporation of the SO3 and separation of acid traces. The high-purity SO3 is then enriched with inert gas and the SO3 is absorbed into sulfuric acid.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: May 25, 2004
    Assignee: Merck Patent GmbH
    Inventors: Martin Hostalek, Werner Büttner, Rolf Hafner, Chih-Peng Lu, Ching-Jung Kan, Ekkehart Seitz, Ernst Friedel
  • Hydraulic shut-off valve
    Patent number: 6270055
    Abstract: In a hose coupling with a coupling sleeve and a coupling nipple and a valve insert (9) provided therein, the valve spring, the holding element and the valve seat of the valve insert are designed as a one-piece component, and the valve spring (11) has a cavity (21) which is closeable.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: August 7, 2001
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Andreas Szeteli, Werner Büttner, Martin Benzinger