Patents by Inventor Valentina Y. Shefter

Valentina Y. Shefter 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).

  • Co-cracking of BPA and phenol process tars
    Patent number: 5504251
    Abstract: This invention relates to processing of a mixture of tars produced in phenol manufacture and in bisphenol manufacture. The heating of a bottom liquid from a bisphenol-A process together with phenol tar from in a cumene-to-phenol process in a distillation column-type thermal cracking reactor at 290.degree.-360.degree. C. at a mass ratio of 1:(1-10) is employed. The process is carried out by feed entering into the middle of the column and valuable products removed as overhead.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: April 2, 1996
    Assignee: General Electric Company
    Inventors: Arkady S. Dyckman, Andrey V. Zinenkov, Boris I. Gorovits, Valentina Y. Shefter, John W. Fulmer, William D. Kight