Patents by Inventor Voldemar Y. Grinshtein

Voldemar Y. Grinshtein 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).

  • Method for preparing hydroxy compounds of aromatic and heteroaromatic series
    Patent number: 4718994
    Abstract: A method for perparing hydroxy compounds of the aromatic and heteroaromatic series of the general formula: ##STR1## wherein when R.sub.1 .dbd.--COOH, --CH.sub.2 CH(NH.sub.2)COOH then R.sub.2 .dbd.--OH, --H, --COOH; R.sub.3 .dbd.--H, --OH; R.sub.4, R.sub.5 .dbd.--H with no connecting bond; R.sub.6 .dbd.--OH; and when R.sub.1,R.sub.6,R.sub.3 .dbd.--H, R.sub.2 .dbd.--OH; then R.sub.4 .dbd.>NH; R.sub.5 .dbd.--CR.sub.7 .dbd.CHR.sub.4, where R.sub.7 .dbd.--CH.sub.2 --CH.sub.2 --NH.sub.2, --CH.sub.2 --CH(NH.sub.2)COOH, consists in that aromatic and heteroaromatic compounds of the general formula ##STR2## wherein when R.sub.1 .dbd.--COOH, --CH.sub.2 CH(NH.sub.2)COOH, then R.sub.2 .dbd.--OH, --H, --COOH; R.sub.3 .dbd.--H, --OH; R.sub.4,R.sub.5 .dbd.--H with no connecting bond; and when R.sub.1,R.sub.2,R.sub.3 .dbd.--H, then R.sub.4 .dbd.>NH; R.sub.5 .dbd.--CR.sub.7 .dbd.CHR.sub.4, where R.sub.7 .dbd.--CH.sub.2 --CH.sub.2 --NH.sub.2, --CH.sub.2 --CH(NH.sub.2)COOH.
    Type: Grant
    Filed: June 14, 1985
    Date of Patent: January 12, 1988
    Assignee: Latviisky Gosudarstvenny Universaitet Imeni P. Stuchki
    Inventors: Andrei K. Zhagars, Voldemar Y. Grinshtein, Sniedzite A. Ozola, Andris K. Zitsmanis, Avgust K. Arens
  • 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