Patents Represented by Attorney Karl C. Hanson

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  • Tube-formed earplug with integral stem
    Patent number: 7886744
    Abstract: An earplug and a method of manufacturing the earplug are provided, the earplug including a sound attenuating element and a stem where the sound attenuating element includes a flange which extends rearwardly over a portion of the stem, and where the sound attenuating element and the stem are integrally formed of a resilient compressible material.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: February 15, 2011
    Assignee: 3M Innovative Properties Company
    Inventor: Richard Knauer