Patents by Inventor Erwin Hertl

Erwin Hertl 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).

  • Rotor blade and screen comprising a rotor blade
    Patent number: 10724175
    Abstract: The invention relates to a blade for screens for the treatment of a fibrous suspension, said blade being mountable on a rotor of the screen. According to the invention, the blade has a curved leading edge or curved envelope of the leading edge, the curvature extending in the direction of the trailing edge, and a curved trailing edge or curved envelope of the trailing edge, said curvature extending in the same direction as the other one. The invention also relates to a screen comprising a rotor on which the disclosed blades are mounted.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: July 28, 2020
    Assignee: ANDRITZ AG
    Inventors: Alexander Gscheider, Erwin Hertl
  • Rotor Blade and Screen Comprising a Rotor Blade
    Publication number: 20190040578
    Abstract: The invention relates to a blade for screens for the treatment of a fibrous suspension, said blade being mountable on a rotor of the screen. According to the invention, the blade has a curved leading edge or curved envelope of the leading edge, the curvature extending in the direction of the trailing edge, and a curved trailing edge or curved envelope of the trailing edge, said curvature extending in the same direction as the other one. The invention also relates to a screen comprising a rotor on which the disclosed blades are mounted.
    Type: Application
    Filed: November 15, 2016
    Publication date: February 7, 2019
    Inventors: Alexander Gscheider, Erwin Hertl
  • Process for controlling operation of a flotation cell
    Patent number: 7296682
    Abstract: A method for controlling operation of a flotation cell, where the liquid level and the foam level in the cell are measured and controlled. The method includes measuring at least one quality characteristic of the accept leaving the cell and determining the set value(s) for the liquid level and/or the foam level on the basis of the measured quality characteristic. The method is particularly suitable for flotation of a pulp suspension, particularly in deinking flotation.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: November 20, 2007
    Assignee: Andritz AG
    Inventors: Helmuth Gabl, Andreas Gorton-Hülgerth, Erwin Hertl
  • Process for pulping waste paper containing impurities
    Publication number: 20060011314
    Abstract: The invention relates to a process for pulping waste paper containing impurities, used in the production of paper and board, with a feed device, a dewiring unit, and a pulping section. In order to improve pulping and thus generate less non-screenable impurities, which would make it possible to use larger proportions of waste paper with water-soluble inks, a liquid penetration stage is included in the process before pulping.
    Type: Application
    Filed: July 14, 2005
    Publication date: January 19, 2006
    Inventors: Erwin Hertl, Peter Sket
  • Process for controlling operation of a flotation cell
    Publication number: 20040200778
    Abstract: A method for controlling operation of a flotation cell, where the liquid level and the foam level in the cell are measured and controlled. The method includes measuring at least one quality characteristic of the accept leaving the cell and determining the set value(s) for the liquid level and/or the foam level on the basis of the measured quality characteristic. The method is particularly suitable for flotation of a pulp suspension, particularly in deinking flotation.
    Type: Application
    Filed: March 9, 2004
    Publication date: October 14, 2004
    Inventors: Helmuth Gabl, Andreas Gorton-Hulgerth, Erwin Hertl
  • Process for aerating dispersions
    Patent number: 6475337
    Abstract: A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process. The process includes at least two stages, where each stage has a separate liquid circulating system which sucks in the gas or air and mixes it with the liquid. The device has at least two flotation cells, with each of the cells having a separate injector and a separate circulation system including a pump.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: November 5, 2002
    Assignee: Andritz AG
    Inventors: Helmuth Gabl, Erwin Hertl, Bernhard Scherzinger
  • Process and device for aerating dispersions
    Publication number: 20010025693
    Abstract: A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process. The process includes at least two stages, where each stage has a separate liquid circulating system which sucks in the gas or air and mixes it with the liquid. The device has at least two flotation cells, with each of the cells having a separate injector and a separate circulation system including a pump.
    Type: Application
    Filed: February 2, 2001
    Publication date: October 4, 2001
    Inventors: Helmuth Gabl, Erwin Hertl, Bernhard Scherzinger