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| | Patent 5,875,775 |
 | | The improvement to the basic mask construction is a breathing adaptor provided on the interior side of the mask face, which encloses a one-way respirator. |
 | | The breathing adaptor maintains the mouth and nose spaced apart from the filter, and efficiently directs breathing efforts to equalize inhalation airflow via substantially all of the filter, while the one-way valve eases exhalation airflow and reduces condensation on the interior side of the visor. |
 | | breathing adaptor means comprising a flexible material within the mask interior enclosing at least the mouth and maintaining spaced apart therefrom a one-way respirator and the filter, said breathing adaptor means providing uniform inhalation airflow via substantially all of the filter, while easing exhalation airflow via said one-way respirator. |
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