Patents by Inventor Friedrich Blume, heir

Friedrich Blume, heir 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: 4035914
    Abstract: A shear foil for a dry shaver has a flexible sheet material body a central portion of which is provided with holes of a diameter between substantially 0.3 and 0.7 millimeters for the passage of beard stubble, and peripheral portions of which serve as mounting portions and are provided with holes of a diameter smaller than those in the central portion but not less than substantially 0.02 millimeters. The holes in the respective portions are separated by sheet material strips whose dimensions are so selected that the bending resistance of the shear foil body is substantially uniform throughout and that the portions of the body can withstand the maximum expected tensile and pressure forces.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: July 19, 1977
    Assignee: Braun Aktiengesellschaft
    Inventors: Friedrich Blume, deceased, Monika Ingrid Blume, heir, Friedrich Blume, heir, Werner Messinger, Josef Schiffer