Patents by Inventor Eberhard Bandtel

Eberhard Bandtel 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 preparation of trimethylolpropane
    Patent number: 4514578
    Abstract: Trimethylolpropane is prepared in such a manner that butyraldehyde is metered into a mixture of water, alkaline condensing agent and formaldehyde, which contains less than 0.1 mol of methanol relative to 1 mol of formaldehyde, at temperatures from 15.degree. to 50.degree. C., and after addition of the butyraldehyde the reaction mixture is heated up to 90.degree. C., sufficient water being present in the reaction mixture so that the reaction mixture has a content of trimethylolpropane of 5 to 25% by weight after the reaction.
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: April 30, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Immel, Hans-Helmut Schwarz, Hein Quast, Eberhard Bandtel
  • Process for isolating boron-containing phenol/formaldehyde resins
    Patent number: 4232134
    Abstract: Boron containing phenol/formaldehyde resins can be isolated from their reaction media by evaporating said resins in a spiral flow evaporator which has a ratio between throughput and tube cross section from 0.1 to 1.5 and a ratio between throughput and evaporation surface from 100 to 400.
    Type: Grant
    Filed: November 6, 1979
    Date of Patent: November 4, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Eberhard Bandtel, Walter Traudisch, Georg Spott, Dieter Freitag
  • Use of an apparatus for continuous photopolymerization
    Patent number: 4211751
    Abstract: For photopolymerization, glass cylinders through which a mechanically stirred stream of ethylinically unsaturated monomeric material continually flows are irradiated from the exterior with light which initiates polymerization.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: July 8, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Berthold Keggenhoff, Eberhard Bandtel, Hans J. Rosenkranz
  • Abrasion resistant catalyst
    Patent number: 4157986
    Abstract: A process for the preparation of catalyst granulates from carbon black, boric acid, water and optionally nitrogenous additives, characterized in that from 3 to 50% by weight of a finely divided catalyst, which has already been used for the preparation of caprolactam and which has optionally been regenerated, are added.
    Type: Grant
    Filed: September 9, 1977
    Date of Patent: June 12, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harry Danziger, Otto Immel, Bernd-Ulrich Kaiser, Hans-Helmut Schwarz, Eberhard Bandtel