Patents by Inventor Karoly Csergo

Karoly Csergo 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 manufacturing methylene-bis (dibutyl-dithiocarbamate) with ASTM colour less than 2
    Patent number: 5744629
    Abstract: The invention relates to improved manufacture of methylene bis-(dibutyl-dithiocarbamate) with ASTM coulour less than 2, by reacting aqueous solutions of dibutyl amine and sodium hydroxide with carbon disulfide, treating the obtained reaction product with methylene dichloride, followed by vacuum stripping, phase separation and filtration of the precipitated sodium chloride. According to the invention, during reaction with carbon disulfide the temperature of the mixture is kept at or below 15.degree. C. and the vacuum stripping is performed in two steps, first between 45.degree. C. and 100.degree. C. and at a pressure of 5-50 kPa, then phase separation is carried out at a temperature between 35.degree. C. and 50.degree. C., followed by stripping the separated organic phase in vacuum also at a temperature between 45.degree. C. and 100.degree. C. and at a pressure of 5-50 kPa.
    Type: Grant
    Filed: February 2, 1996
    Date of Patent: April 28, 1998
    Assignee: MOL Magyar Olaj- es Gazipari Rt.
    Inventors: Bela Jover, Janos Forstner, Jozsef Petro, Szabolcs Szoboszlay, Imre Fekete, Karoly Csergo, Gyula Sztreharszki, Gyula Raksi, Janos Kiss, Ferenc Miko, Jeno Baladincz, Jozsef Toth