Patents by Inventor Ottomar Gradl

Ottomar Gradl 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).

  • Arrangement for attaching blades on the wheel of a rotor
    Patent number: 5174720
    Abstract: To attach blades (5) on a rotor wheel for turbines or compressors, the wheel (1) has threads (2) running to the inside in a spiral shape on both sides of the outer edge. The blades (5) have segments on their feet (7) of counter-threads shaped accordingly. The threads are designed to have one turn, and their beginnings are staggered 180.degree. to one another on both sides of the wheel to offset inbalances. The threads on the wheel and on the blade feet there are self-locking and prestressed.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: December 29, 1992
    Inventor: Ottomar Gradl