Patents Assigned to Dr. Muller AG
  • Method of and filter thickener for thickening of suspensions
    Patent number: 4578197
    Abstract: A method of and an arrangement for thickening of suspensions includes filtering of a suspension through candlelike filter elements in a filter container, backwashing the filter elements individually without interrupting the filtration process by applying pressure impulses of gaseous backwash medium to the pressure elements in a direction opposite to the filtration direction, wherein the gaseous backwash medium forms a gas chamber over the filter elements separated from the suspension fluid and having an adjustable pressure.
    Type: Grant
    Filed: July 23, 1982
    Date of Patent: March 25, 1986
    Assignee: DrM Dr. Muller AG
    Inventor: Hans Muller
  • Filter apparatus for continuously thickening suspensions
    Patent number: 4511471
    Abstract: A filter apparatus for continuously thickening a suspension is proposed. The filter apparatus consists of a housing which accommodates a plurality of filter elements depending on individual collecting pipes. The collecting pipes are located parallel to each other and are separated by intermediate walls which extend beyond the collecting pipes and the filter elements in axial direction.
    Type: Grant
    Filed: June 2, 1983
    Date of Patent: April 16, 1985
    Assignee: DrM, Dr. Muller AG
    Inventor: Hans Muller
  • Method and apparatus for cleaning pressure filters
    Patent number: 4500435
    Abstract: A method for cleaning pressure filters by means of a backwash cleaning gas or liquid supplied into the pressure vessel and impulsively pressed through the filter fabric of filtering elements to remove the filter cake deposited on the filter fabric during the filtering process.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: February 19, 1985
    Assignee: DrM, Dr. Muller AG
    Inventor: Hans Muller
  • Arrangement for fastening filter candles and filter apparatus provided therewith
    Patent number: 4488965
    Abstract: An arrangement for fastening filter candles and filter apparatus provided therewith includes a collecting pipe which is composed of several T-shaped pipe pieces. Each of the pipe pieces has a substantially horizontal portion and extending therefrom a second portion which has a free end part provided with a groove. Each of the filter candles has an upper part provided with a flange portion which is engageable into the groove to obtain a tight attachment of the filter candle to the collecting pipe.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: December 18, 1984
    Assignee: DrM, Dr. Muller AG
    Inventors: Hans Muller, Ivo Schumacher
  • Filter element
    Patent number: 4473472
    Abstract: Filter element for a pressure filter container, composed of a central tube surrounded by a plurality of support tubes for supporting a filter web. The support tubes can be closed or perforated. The space between the central tube and support tubes, as well as the interior in the case of perforated support tubes, serve as flow canal for the filtrate. The use of plastic tubing provides a simple and cost-favorable filter element.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: September 25, 1984
    Assignee: Dr. Muller AG
    Inventor: Hans Muller
  • Backwash multiple alluvial filter and method of filtering therewith
    Patent number: 4439327
    Abstract: A backwashing alluvial filter has a vertical filter container, a plurality of collecting pipes removably mounted in the container, a plurality of filter elements suspended on the collecting pipes, separating walls subdividing the interior of the filter container into at least two chambers, and communicating with one another via vertical overflow shafts. Washing off of solid matter is performed by supplying a washing liquid via pipes directly under the overflow shafts.
    Type: Grant
    Filed: June 29, 1982
    Date of Patent: March 27, 1984
    Assignee: Dr. Muller AG
    Inventor: Hans Muller