Patents by Inventor Keld T. Helmuth

Keld T. Helmuth 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).

  • Telephone handset attachment for use in-the-ear hearing aids
    Patent number: 4864611
    Abstract: An attachment for a telephone handset used by users of in-the-ear hearing aids including a cup shaped member which acoustically couples the handset to the ear and serves to cancel feedback between the hearing aid receiver and microphone.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: September 5, 1989
    Inventor: Keld T. Helmuth
  • Hearing aid transducer or the like
    Patent number: D280022
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: August 6, 1985
    Assignee: Phonic Ear, Inc.
    Inventors: Philip S. Egan, Keld T. Helmuth, Richard G. Pimentel, Tom B. Soerensen