Patents by Inventor Janina Olkowska

Janina Olkowska 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 to manufacture bisphenol A
    Patent number: 5198591
    Abstract: The invention relates to a process for obtaining a high purity bisphenol from a post-reaction mixture resulting from the step of synthesis of phenol and acetone in the presence of a strong acid cation exhanger catalyst, by the way of crystallation and separation by distillation followed by recovery of bisphenol-A from the step of thermal catalytic decomposition of by product of the principal process technology in a multistage process.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: March 30, 1993
    Assignees: Instytut Ciezkiej Syntezy Organicznej "Blachownia", Zaklady Chemiczne "Blachownia", ABB Lummus Crest Inc.
    Inventors: Maciej Kiedik, Jozef Kolt, Jerzy Marszycki, Eugeniusz Zajac, Teodor Bek, Zbigniew Swiderski, Anna Rzodeczko, Jerzy Mroz, Janina Olkowska