Patents by Inventor Derek W. Powell

Derek W. Powell 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).

  • Coil assemblies
    Patent number: 5610989
    Abstract: This invention relates to coil assemblies and in particular, but not exclusively, to such assemblies for acoustic transducers. Thus a transducer 10 includes a case 11 in which is located a coil 16 mounted on a flexi-circuit, which locates the coil 16 for its assembly handling and which allows various configurations within the case 11. A method of winding the coil 16 and mounting it on the carrier 17 is also described.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: March 11, 1997
    Assignee: Knowles Electronics Co.
    Inventors: Richard J. Salvage, Steven J. Harrington, Derek W. Powell