Patents by Inventor Urs Arni

Urs Arni 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 production of malonic acid dinitrile and purification thereof
    Patent number: 4105688
    Abstract: Malonic acid dinitrile is prepared by reacting acetonitrile and cyanogen chloride in the gaseous phase at temperatures from 740.degree. to 780.degree. C. Temperatures from 750.degree. to 760.degree. C. with molar ratios of 1:1 to 1:5 of cyanogen chloride to acetonitrile are preferred. The crude mixture containing malonic acid dinitrile may be purified by conversion of the principal impurities to easily separable compounds by a Diels-Alder or selective hydrogenation reaction.
    Type: Grant
    Filed: April 26, 1971
    Date of Patent: August 8, 1978
    Assignee: Lonza, Ltd.
    Inventors: Urs Arni, Adriano Faucci, August Stocker