Patents by Inventor Helmut Blaser

Helmut Blaser 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).

  • Bridged anthraquinones
    Patent number: 5912386
    Abstract: The present invention relates to compounds of the formula (I)R.sup.1 --NH--B--NH--R.sup.2 (I),whereinR.sup.1 and R.sup.2 independently of one another denote an unsubstituted or substituted radical of the formula ##STR1## and B represents an unsubstituted or substituted cycloalkylene-containing bridge member, which are suitable for bulk dyeing of plastics.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: June 15, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Kalz, Karl-Heinz Reinhardt, Helmut Blaser