Patents by Inventor Heinz Durr

Heinz Durr 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).

  • Photochromic dental material
    Patent number: 5698020
    Abstract: The invention relates to dental materials which contain a photochromic material such as for example a photochromic dye, a photochromic glass, a photochromic ceramic and/or a photochromic glass ceramic and which can be visually distinguished from natural tooth material after irradiating with light, but which assume their original colour again after a certain period has expired.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: December 16, 1997
    Assignee: Ivoclar AG
    Inventors: Ulrich Salz, Peter Burtscher, Volker Rheinberger, Heinz Durr
  • Pyrrolo[1,2-b]azines
    Patent number: 4983324
    Abstract: Non-linear optical materials contain the structural elements of the general formula I and/or I' ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.3', R.sup.4, R.sup.5, R.sup.6, R.sup.7 and Z have the meaning indicated in patent claim 1.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: January 8, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Heinz Durr, Volker Bach
  • Method and apparatus for treating a workpiece at a treating station
    Patent number: 3952699
    Abstract: A workpiece, such as the body of a vehicle is advanced in suspended condition in one of two transversely spaced paths until it is opposite a treating station which is located between and spaced from both of the paths. There are several such treating stations provided, spaced along the paths, and they are each capable of affording a different treating action. The workpiece is placed opposite the desired work treating station and is then shifted transversely of the paths to the treating station where it undergoes treatment, to be subsequently shifted to the other of the paths and along the same.BACKGROUND OF THE INVENTIONThe present invention relates generally to the treating of workpieces, and more particularly to a method of and an apparatus for treating of workpieces. Still more particularly, the invention relates to a method of treating a vehicle body or the like by providing it with a surface coating, and to an apparatus for carrying out the method.
    Type: Grant
    Filed: March 19, 1974
    Date of Patent: April 27, 1976
    Inventors: Heinz Durr, Klaus Gafgen