Patents by Inventor Hermann Spaar

Hermann Spaar 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).

  • Conveyor belt
    Patent number: 3973670
    Abstract: A conveyor belt with continuous longitudinal reinforcement strands has a mechanical transverse barrier to prevent longitudinal ripping slitting or tearing. The mechanical transverse barrier is a fabric with warp and weft threads embedded in a cover layer of the conveyor belt. The longitudinally running threads have a substantially lower tensile strength than the transversely running threads, i.e. the tensile strength of the transverse threads is at least 8 times that of the longitudinal threads and preferably upwards of 20 (e.g. 30 to 50) times that of the longitudinal threads.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: August 10, 1976
    Assignee: Clouth Gummiwerke AG
    Inventor: Hermann Spaar