Patents by Inventor John L. Hoellerich

John L. Hoellerich 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).

  • Marching timpani
    Patent number: 4122749
    Abstract: A machine-tuning marching timpani having an adjusting apparatus arranged in a thin, generally planar configuration permitting the elimination of the conventional deep shell portion of such timpani.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: October 31, 1978
    Assignee: Slingerland Drum Co.
    Inventor: John L. Hoellerich