Patents by Inventor Valentina Fedorovna Kashina

Valentina Fedorovna Kashina 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 of recovering primary and secondary amines
    Patent number: 4061633
    Abstract: A method of recovering primary or secondary amines from aqueous, organic or aquo-organic solutions of said amines by subjecting these solutions to distillation or rectification in the presence of carbonic acid.
    Type: Grant
    Filed: February 25, 1974
    Date of Patent: December 6, 1977
    Inventors: Lazar Isaevich Blyakhman, Sergei Lvovich Davydov, Valentina Fedorovna Kashina