Patents by Inventor Gunther Klug

Gunther Klug 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).

  • Patent number: 5178670
    Abstract: A color former for pressure- and heat-sensitive recording systems containinga) at least one 3,1-benzoxazine of the formula ##STR1## b) at least one fluoran of the formula ##STR2## c) at least one 3,1-benzoxazine of the formula ##STR3## and/or at least one lactone of the formula ##STR4## in which the substituents have the meanings given in the description, produces black colorations having good color intensity.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: January 12, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunther Klug, Horst Berneth, Gert Jabs