Patents by Inventor Csaba Kayos

Csaba Kayos 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 preparing N-phosphonomethyl-glycine
    Patent number: 4983764
    Abstract: The invention relates to an improvement of a process for preparing N-phosphonomethyl-glycine by oxydation of N-phosphonomethyl-imino-diacetic acid in an aqueous sulphuric acidic medium with hydrogen peroxide.A characteristic feature is using a waste acid liquor as reaction medium formed as aqueous sulphuric acid and obtained after the separation of N-phosphonomethyl-glycine when carrying out oxydation. This solution is optionally diluted with water until a concentration of 12-18 weight % of sulphuric acid and 3-5 weight % of N-phosphonomethyl-glycine.
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: January 8, 1991
    Assignee: Nitrokemia Ipartelepek
    Inventors: Jeno Pelyva, Laszlo Lendvai, Sandor Balint, Zoltan Kolonics, Csaba Soptei, Sandor Laszlo, Bela Karacsonyi, Janosne Benczik, Csaba Kayos, Sandor Silye
  • Process for preparing N-phosphono-methyl-imino-diacetic acid
    Patent number: 4931585
    Abstract: The invention relates to the preparation of N-phosphono-methyl-imino-diacetic acid from the calcium salt of imino-diacetic acid in a simplified synthesis. The process comprises in that the imino-diacetic acid calcium salt is heated with concentrated hydrochloric acid in a molar ratio of 2-3:1 at a temperature between 50.degree.-100.degree. C., the obtained imino-diacetic acid hydrogen-chloride is separated then dissolved in water and is reacted with phosphorous acid in a molar ratio of 1.0-1.2:1 calculated for imino-diacetic acid hydrogen chloride and with the aqueous solution of formaldehyde in a molar ratio of 1.0-1.4:1 under stirring, and the obtained product is isolated.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: June 5, 1990
    Assignee: Nitrokemia Ipartelepek
    Inventors: Jeno Pelyva, Csaba Soptei, Zoltan Kolonics, Bela Karacsonyi, Sandor Balint, Janosne Benczik, Csaba Kayos, Laszlo Lendvai, Sandor Laszlo