Patents by Inventor Martin D. Allkins

Martin D. Allkins 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).

  • Moisture barrier assembly
    Patent number: 4920564
    Abstract: A microphone unit for a telephone handset comprises a microphone mount, a microphone mounted in the microphone mount, a mouthpiece detachably fixed to the handset, and a moisture barrier assembly for preventing ingress of moisture into the microphone. The moisture barrier assembly is constituted by a moisture barrier, an annular seal and a support plate. The support plate has a perforated portion covered by, but spaced from, the moisture barrier. The moisture barrier assembly is positioned between the mouthpiece and the microphone mount. Venting means vents a space between the moisture barrier and the microphone. The moisture barrier is constituted by a moisture impermeable film whose peripheral edge portion is fixed to the annular seal. The seal is fixed to the support plate and seals against the front face of the microphone.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: April 24, 1990
    Assignee: British Telecommunications public company limited
    Inventor: Martin D. Allkins