Patents by Inventor Jindrich Lorenz

Jindrich Lorenz 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).

  • Pencil sheath and composition therefor
    Patent number: 4176978
    Abstract: There is disclosed a pencil sheath and composition therefor, the pencil having a core of graphite and the like. The sheath composition is composed substantially of plastics, fillers and two kinds of foaming agents with different decomposition temperatures. The pencil sheath has good cutting or sharpening properties, increased bending strength, and good adhesion to the graphite pencil core.
    Type: Grant
    Filed: January 9, 1979
    Date of Patent: December 4, 1979
    Inventors: Jan Ruzicka, Jindrich Lorenz, Vladimir Marek, Miroslav Tusl