Patents by Inventor Tamas Kallai

Tamas Kallai 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 preparation of benzimidazole-thiol
    Patent number: 4675413
    Abstract: A new process is disclosed for preparing a compound of the formula (I) ##STR1## wherein R is C.sub.1 to C.sub.5 alkyl; which comprises reducing a compound of the formula (II) ##STR2## or salt thereof wherein A is --SO.sub.2 X, --SOH, --SOA.sup.1, or --SA.sup.1 group,X is chlorine or hydrogen; andA.sup.1 is a group of the Formula ##STR3## with the aid of aluminum activated with a catalytic amount of a metal and/or metal salt in a mixture of water, a mineral acid, and an aliphatic carboxylic acid having 1 to 3 carbon atoms at a temperature of 0.degree. to 100.degree. C., thereafter, optionally, the product is recovered from an acid medium at a pH range of 2 to 3 in crystalline form.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: June 23, 1987
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara rt
    Inventors: Maria Bakonyi, Gyorgy Lugosi, Tamas Kallai, Maria Hima nee Toth, Tibor Montai, Maria Sziladi