Patents by Inventor Harald Kuppelhamier

Harald Kuppelhamier 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).

  • Azulenesquaric acid dyes that contain urethane groups
    Patent number: 4990649
    Abstract: Azulenesquaric acid dyes of the formula ##STR1## where L is substituted or unsubstituted C.sub.1 -C.sub.12 -alkylene,R.sup.1 is C.sub.1 -C.sub.20 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl andR.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl,with the proviso that when R.sup.5 is hydrogen the positions of the substituents CH.sub.2 --L--O--CO--NHR.sup.1 and R.sup.4 on an azulene ring may also be interchanged within a ring in either or both of the azulene rings, derived from azulene intermediates that contain urethane groups, are suitable for use in an optical recording medium.
    Type: Grant
    Filed: May 2, 1989
    Date of Patent: February 5, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Schrott, Peter Neumann, Michael Schmitt, Sibylle Brosius, Klaus D. Schomann, Harald Kuppelhamier