Patents by Inventor Erhard-Gunther Hoffmann

Erhard-Gunther Hoffmann 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 the continuous preparation of benzyl alcohol
    Patent number: 5750801
    Abstract: The invention relates to a process for the preparation of benzyl alcohol by hydrolysis of benzyl chloride with water at elevated temperatures, which avoids any wastewater pollution.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: May 12, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Ursula Jansen, Pieter Ooms, Erhard-Gunther Hoffmann, Bernd-Ulrich Schenke
  • Process for the preparation of benzyl alcohol
    Patent number: 5728897
    Abstract: A novel process for the preparation of benzyl alcohol by the hydrolysis of benzyl chloride, which operates with from 10 to 70 times the molar quantity of water at temperatures of from 80.degree. to 180.degree. C. and stops the reaction before complete conversion is reached, avoids both the addition of bases and water-soluble organic solvents and also the formation of sodium chloride.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: March 17, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Erhard-Gunther Hoffmann, Ursula Jansen, Pieter Ooms, Bernd-Ulrich Schenke
  • Process for the separation of a mixture of benzyl chloride, benzyl alcohol, dibenzyl ether and aqueous hydrochloric acid
    Patent number: 5670029
    Abstract: A process for the separation of a mixture which contains benzyl chloride, benzyl alcohol, dibenzyl ether and aqueous hydrochloric acid, wherein said mixture is continuously introduced via a side-feed into a distillation column from which aqueous hydrochloric acid and benzyl chloride are continuously taken off as overhead product, benzyl alcohol and dibenzyl ether are continuously taken off as bottom product, thereby the formation of dibenzyl ether is reduced or virtually prevented.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: September 23, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Ursula Jansen, Pieter Ooms, Erhard-Gunther Hoffmann, Bernd-Ulrich Schenke
  • Sheet-shaped, corrosion resistant parts of apparatus
    Patent number: 4839209
    Abstract: Large parts of apparatus are manufactured from a glass fibre reinforced core (2) enclosed in a thin heat-resistant and corrosion-resistant jacket (9) of PVDF attached thereto.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: June 13, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gehard Simon, Peter Hahnel, Erhard-Gunther Hoffmann