Patents by Inventor Hubert Psaar

Hubert Psaar 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).

  • Tetraindolylheptamethine dyestuffs
    Patent number: 5017707
    Abstract: Tetraindolylheptamethine ethers and alcohols of the isomeric formulae ##STR1## and ##STR2## and dyestuffs of the formula ##STR3## in which A, B, D and E denote ##STR4## and D'.sup..sym. denotes ##STR5## and the remaining symbols have the meanings given in the description, are used in pressure- and heat-sensitive recording materials.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: May 21, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Horst Berneth, Hubert Psaar, Gert Jabs