Patents by Inventor Erwin Walz

Erwin Walz 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 and apparatus for removing dust and gas pollutants from waste gases, particularly waste gases produced in the manufacture of optical waveguide preforms
    Patent number: 4765805
    Abstract: A method is disclosed for purifying waste gases containing extremely finely dispersed pollutants in dust form and pollutants in gas and vapor form, particularly for purifying waste gases produced in chemical vapor phase reactions during the manufacture of optical waveguide preforms. In a first step, dust is extracted in a dry, coated fabric filter (1). The gaseous and vaporous pollutants are then absorbed in a gas scrubber. During this gas-scrubbing process, as soon as the absorption liquid circulating in an absorption-liquid circulation system reaches a pretermined pollutant concentration, part of the absorption liquid is withdrawn from the absorption-liquid circulation system and detoxicated in a separate detoxication circulation system. The part withdrawn is simultaneously replaced by fresh, unpolluted absorption liquid.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: August 23, 1988
    Assignee: Standard Elektrik Lorenz A.G.
    Inventors: Rudolf Wahl, Erwin Walz