Patents by Inventor Nikolai B. Novak

Nikolai B. Novak 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).

  • Photochemical method for preparing 4-keto-9-methylphenazine
    Patent number: 4610767
    Abstract: A method for preparing 4-keto-9-methylphenazine, which comprises methylation of phenazine with dimethylsulphate, followed by keeping the resulting reaction mixture at a temperature within the range of from 0.degree. to 10.degree. C. and carrying out a photo-chemical oxidation of the resulting 9-methylphenazinium methylsulphate by UV-irradiation for not longer than 3 hours, bringing the pH of the reaction mixture to 8.5-9.5, a repeated irradiation thereof for additional 3-5 hours, and isolation of the desired product.
    Type: Grant
    Filed: May 8, 1985
    Date of Patent: September 9, 1986
    Assignee: Latviisky Gosudarstvenny Universitet Imeni P.Stuchki
    Inventors: Andrei K. Zhagars, Voldemar Y. Grinshtein, Nikolai B. Novak