Patents by Inventor Alexei V. Efimov

Alexei V. Efimov 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 purification of waste waters from aromatic amines
    Patent number: 4324667
    Abstract: The present invention relates to chemical processes for purification of industrial waste waters from aromatic amines.The process of the invention is characterized in that into waste waters aromatic di- or polyisocyanates are introduced in a molar ratio with aromatic amines ranging from 1:1 to 30:1 respectively. The resulting precipitate is separated from the purified waste waters. The aromatic isocyanates can be introduced into waste waters as solutions in inert organic solvents.The process of this invention can be useful in processes for the production of aromatic amines and derivatives thereof, for example aromatic isocyanates.
    Type: Grant
    Filed: October 17, 1980
    Date of Patent: April 13, 1982
    Inventors: Igor I. Konstantinov, Antonina I. Kormushechkina, Jury A. Avdonin, Vladimir M. Kotlyarsky, Albert A. Kim, Nikolai V. Obraztsov, Alexei V. Efimov
  • Reticulate polymers based on oligourethanacrylates and method for their manufacture
    Patent number: 4258164
    Abstract: A method for preparing olegourethanacrylates having the general formula ##STR1## where ##STR2## is a radical of a telogen; X is H, CH.sub.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: March 24, 1981
    Inventors: Alfred A. Berlin, Tamara Y. Kefeli, Nina V. Varlamova, Grigory M. Strongin, Judif M. Altshuler, Boris I. Kolomazov, Alexei V. Efimov
  • Oligourethanacrylates and methods for their manufacture
    Patent number: 4250322
    Abstract: A method for preparing oligourethanacrylates having the general formula ##STR1## where ##STR2## is a radical of a telogen; X is H, CH.sub.
    Type: Grant
    Filed: August 10, 1979
    Date of Patent: February 10, 1981
    Inventors: Alexei V. Efimov, Alfred A. Berlin, Tamara Y. Kefeli, Nina V. Varlamova, Grigory M. Strongin, Judif M. Altshuler, Boris I. Kolomazov