Patents by Inventor Helfrid Sander

Helfrid Sander 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).

  • UV-curing printing inks
    Patent number: 4056453
    Abstract: Printing inks which cure under the action of UV radiation. The inks consist ofA. pigmentB. a mixture of benzophenone and Michler's ketone as the photoinitiatorC. a urethane-acrylateD. an epoxy-acrylate and/orE. a N-methylol-acrylamide-ether or N-methylol-methacrylamide-ether.
    Type: Grant
    Filed: July 29, 1976
    Date of Patent: November 1, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Barzynski, Guenter Heil, Karl Klemm, Helfrid Sander