Patents by Inventor Istvan Apro

Istvan Apro 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).

  • Process for the separation of solid phase from liquid substance, particularly for waste water purification
    Patent number: 5071566
    Abstract: A method is provided for removing a solid phase from a liquid substance, which is kept in a continuous turbulent flow. The method is characterized by adding simultaneously at consecutive places in the flow direction of the liquid substance, cement, iron (III)-chloride-sulfate and an anion polyelectrolyte. Cement is added at a first place, iron (III)-chloride-sulfate at a second place and anion polyelectrolyte at a third place.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: December 10, 1991
    Assignee: Innoterv Ipari Fovallalkozo Kisszovetkezet
    Inventors: Endre Papp, Istvan Papp, Lajos Szabo, Istvan Apro, Gyula Czepek, Ferenc Torocsik, Bela Konkoly, Pal Karcagi, Janos Takacs, Tamas Foldi
  • Process for preparing an agricultural fertilizer from sewage
    Patent number: 4772307
    Abstract: Contaminated water is contacted with an agent which contains salts or cations of mono-, di-, or trivalent metals in a maximum amount of 50 masspercent and rock granules containing at least 25 masspercent zeolite, preferably clinoptilolite and/or mordenite. The amount of metal salts respectively cations present in the parent zeolitic rock can be increased according to necessity by ion-exchange, adsorption and/or impregnation, i.e. by combination of these processes following eventual dehydration. The agent obtained is homogenized. The exhausted bed can be regenerated biologically or with aqueous solution of a potassium salt.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: September 20, 1988
    Inventors: Jeno Kiss, Adam Hosszu, Bala Deak, Denes Kallo, Janos Papp, Agnes Meszaros nee Kis, Mucsy, Gyorgy, Jozsef Olah, Gyorgy Urbanyi, Tivadar Gal, Istvan Apro, Czepek, Gyula, Ferenc Torocsik, Andras Lovas