Mask for breath analysis
Patent 5265595 Issued on November 30, 1993. Estimated Expiration Date: 
March 9, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 9, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2449053 3232288 3420224 3486366 3580051 Buckle Respirator face mask Method for measuring the degree of nasality Alarm system for respirator apparatus and method of use Method and apparatus for determining respirator face mask fit InventorAssigneeApplicationNo. 028720 filed on 03/09/1993US Classes:128/204.18, Means for supplying respiratory gas under positive pressure128/204.23, Means for sensing condition of user's body128/205.25Face mask covering a breathing passageExaminersPrimary: Burr, Edgar S.Assistant: Lewis, Aaron J. Attorney, Agent or FirmForeign Patent References
International ClassA61M 016/00AbstractAn oral respiratory mouth mask for breath-by-breath ventilatory measurements on humans constructed of silicone or like material. The mouth mask has a curved face sealing flange adapted to sealably engage the user's skin about the mouth and nose including an internal mouth-enclosing chamber having a relatively small dead space within the mask for improved accuracy in ventilatory and metabolism measurements. A direction airflow tubing assembly secured to and in flow communication with the mouth-enclosing chamber operates to effectively direct exhalation products and inhaled air while producing minimum restrictions to normal airflow. The mask is held in a sealed position about a user's mouth by a securing assembly comprising a flexible skull cap, adjustable elastic straps and quick connect fasteners which cooperate with pendulatory eccentric buttons integrally formed on the outer surface of the face mask.Other References
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