Patents by Inventor Herfried Lammer

Herfried Lammer 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).

  • Lightweight tennis racket having high frequency
    Patent number: 6106417
    Abstract: A lightweight, high stiffness tennis racket includes a frame having a handle portion with butt end, head portion, and strings supported by the head portion. The racket is formed from a composite material including carbon fibers, titanium fibers, and epoxy resin and includes a length of at least about 27 inches, weight of less than about 9.2 ounces when strung, and a frequency of vibration of the first mode of bending under free-free constraint of at least about 175 Hz. The racket includes a vibration damping unit located about at the racket handle.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: August 22, 2000
    Assignee: HEAD Sport Aktiengesellschaft
    Inventors: Helmut Umlauft, Herfried Lammer
  • Racquet throat
    Patent number: D460135
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: July 9, 2002
    Assignee: HEAD Sport Aktiengesellschaft
    Inventor: Herfried Lammer