Patents by Inventor Theodor Ploetz, deceased

Theodor Ploetz, deceased 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 of purifying the waste water of paper mills
    Patent number: 4019952
    Abstract: Granular .gamma.-alumina in contact with the waste water of paper mills contaminated with oxygen-demanding, organic substances adsorbs the contaminants, particularly ligninsulfonic acids, and lowers the oxygen demand of the waste water much more effectively than activated charcoal, thereby permitting the purified waste to be fed directly to a secondary biological treatment without damaging the microorganisms.
    Type: Grant
    Filed: December 12, 1975
    Date of Patent: April 26, 1977
    Assignee: Feldmuhle Anlagen- und Produktionsgesellschaft mit beschrankter Haftung
    Inventors: Theodor Ploetz, deceased, by Adelbert Hasse, administrator, Volker Franzen
  • Method of purifying waste water
    Patent number: 3998730
    Abstract: The dissolution and loss of granular .gamma.-alumina in acidic water conted with the alumina for purification from lignin and its derivatives can be reduced or eliminated by adding to the acidic waste water an aluminum salt of mineral acid. A flocculate of aluminum hydroxide having the impurities adsorbed thereon is formed on the granular aluminum oxide, and is converted to .gamma.-alumina when the granular material is calcined in air for combustion of the organic waste material.
    Type: Grant
    Filed: October 16, 1975
    Date of Patent: December 21, 1976
    Assignee: Feldmuhle Anlagen- und Produktionsgesellschaft mit beschrankter Haftung
    Inventors: Theodor Ploetz, deceased, Ursula Haupt, Edeltraud Solich