Patents Represented by Attorney Lawrence A. Hymo

Find this attorney in the Justia Lawyer Directory

  • Method of producing catechol and hydroquinone
    Patent number: 5026925
    Abstract: The nuclear hydroxylation of phenol can be carried out in an industrially very simple manner and with at least the yields obtained with the known methods as well as with very good selectivities by means of using aqueous hydrogen peroxide with the simultaneous addition of sulfur dioxide or selenium dioxide as catalyst.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: June 25, 1991
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karl-Heinz Drauz, Axel Kleeman, Gunter Prescher, Gebhard Ritter