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Respiratory protection device

  • US 8,074,648 B2
  • Filed: 07/14/2009
  • Issued: 12/13/2011
  • Est. Priority Date: 03/31/2006
  • Status: Active Grant
First Claim
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1. A respiratory protection device that comprises:

  • (a) a lens;

    (b) a chassis that surrounds a portion of the lens;

    (c) a face seal that includes an annular ring that has a surface that forms an interface with the chassis; and

    (d) a frame that surrounds an outer surface of the annular ring and that enables the face seal to be clamped to the chassis and that allows the lens and the chassis to be removed from the face seal.

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