Patents by Inventor Erwin Herrmann

Erwin Herrmann 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).

  • Sulfo-containing phenol-formaldehyde condensates
    Patent number: 4079040
    Abstract: Spreadability and/or strength of water-setting inorganic bonding compositions are improved by incorporating in them a water-soluble condensation product of formaldehyde with a diphenol ##STR1## The condensation can also take place in the presence of a water-soluble sulfite, a water-soluble sulfamate, a water-soluble pyrosulfite, a phenol sulfonic acid or a naphthalene sulfonic acid.
    Type: Grant
    Filed: April 30, 1975
    Date of Patent: March 14, 1978
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Joachim Ribka, Otto Trosken, Karlfried Keller, Erwin Herrmann, Wolfgang Bodenstedt, Peter Dorries