Patents by Inventor Alexandr I. Metelkin

Alexandr I. Metelkin 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 titanium tanning agent and use thereof in leather tanning process
    Patent number: 4396387
    Abstract: The present invention relates to methods for preparing a titanium tanning agent from sulphuric-acid titanium-ferriferous solutions and use thereof for leather tanning.The method for preparing a titanium tanning agent from titanium-ferriferous sulphate solutions comprises introduction, into said solution, of an oxidizing agent comprising a sulphuric-acid solution of a peroxy-titanium complex, follows by the addition of ammonium sulphate and sulphuric acid to precipitate a double salt of titanyl and ammonium sulphate in the monohydrate form (NH.sub.4).sub.2 TiO(SO.sub.4).sub.2.H.sub.2 O. The precipitation of this salt is preferably effected prior to its formation in an amount of 75-85% based on TiO.sub.2. The resulting salt is separated and washed; the filtrate and washings are combined and treated with ammonium sulphate to after precipitate the salt which is separated and recycled into the starting solution.
    Type: Grant
    Filed: November 6, 1981
    Date of Patent: August 2, 1983
    Inventors: David L. Motov, Ljudmila P. Tjurkina, Lidia G. Gerasimova, Alexandr I. Metelkin, Isaak G. Shifrin, Nina I. Kolesnikova, Galina G. Yakusheva, Maria M. Godneva, Artur G. Babkin, Iridy I. Mikaelian, Valentin I. Belokoskov, Vladimir P. Plotnikov
  • Method for preparing titanium tanning agent
    Patent number: 4314975
    Abstract: The present invention relates to methods for preparing a titanium tanning agent from sulphuric-acid titanium-ferriferous solutions and use thereof for leather tanning.The method for preparing a titanium tanning agent from titanium-ferriferous sulphate solutions comprises introduction, into said solution, of an oxidizing agent comprising a sulphuric-acid solution of a peroxy-titanium complex, follows by the addition of ammonium sulphate and sulphuric acid to precipitate a double salt of titanyl and ammonium sulphate in the monohydrate form (NH.sub.4).sub.2 TiO(SO.sub.4).sub.2.H.sub.2 O. The precipitation of this salt is preferably effected prior to its formation in an amount of 75-85% based on TiO.sub.2. The resulting salt is separated and washed; the filtrate and washings are combined and treated with ammonium sulphate to afterprecipitate the salt which is separated and recycled into the starting solution.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: February 9, 1982
    Inventors: David L. Motov, Ljudmila P. Tjurkina, Lidia G. Gerasimova, Alexandr I. Metelkin, Isaak G. Shifrin, Nina I. Kolesnikova, Galina G. Yakusheva, Maria M. Godneva, Artur G. Babkin, Iridy I. Mikaelian, Valentin I. Belokoskov, Vladimir P. Plotnikov