Patents by Inventor Theodor Ploetz

Theodor Ploetz 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
  • Method of purifying the waste water of paper mills
    Patent number: 3998731
    Abstract: The biochemical oxygen demand of waste water from paper mills containing nin and other colloidally dispersed organic contaminants is sharply reduced by adsorption of the contaminants from the acidified waste water by granular alumina. The treatment is most effective at pH 2.5 and when the waste water is acidified with hydrochloric acid.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: December 21, 1976
    Assignee: Feldmuhle Anlagen- und Produktionsgesellschaft mit beschrankter Haftung
    Inventors: Volker Franzen, Theodor Ploetz, Ursula Haupt, Edeltraud Solich
  • Process for the manufacture of flat-shaped articles
    Patent number: 3936544
    Abstract: A process is disclosed for manufacturing flat shaped articles made of individual fibers such as paper, woven fabric, knitted fabric and non-woven fabric impregnated with an aqueous dispersion of a polymeric binder including a sensitizing agent for causing the dispersion to coagulate at a temperature substantially below 100.degree.C. The binder coagulates at a temperature substantially below 100.degree.C. and the method includes impinging live steam on the major surfaces of the article to suddenly coagulate the binder, thereby fixing its position within the fabric and preventing its migration to the fabric's surfaces. One or more adjustable position steam nozzles are used for this purpose.
    Type: Grant
    Filed: May 10, 1974
    Date of Patent: February 3, 1976
    Assignee: Feldmuehle Aktiengesellschaft
    Inventors: Helmut Kriebitz, Theodor Ploetz, Popko Julius Westerhuis