Method and apparatus for sensing flow in two directions and automatic calibration thereof
January 29, 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 2255771 3435676 3735752 Variable orifice gas flow sensing head Extended range linear flow transducer Device for sensing air flow Method and apparatus for proving electronic gas meters at low flow rates Flow device with water trap Method and apparatus for calibration of electronic gas meters Flow volume calibrator InventorsAssigneeApplicationNo. 010772 filed on 01/29/1993US Classes:73/861.61, Orifice or flow nozzle73/1.34With signal processing, span or set point adjustment (e.g., zero correction)ExaminersPrimary: Chilcot, RichardAssistant: Patel, Harshad Attorney, Agent or FirmForeign Patent References
International ClassesG01F 025/00G01F 001/42 AbstractA method of calibrating the output of a transducer in a flow path through which a medication is delivered from a hand-held metered dose inhaler is disclosed. The transducer senses flow rates of human breath during inhalation and exhalation through a portion of a flow path in the inhaler. The flow rates have two non-linear flow characteristics in opposite directions. The flow path portion provides flow rate measurements representative of flow paths of the entire system. The method makes it possible to precisely calibrate so that precise doses of medication can be repeatedly delivered to a patient by inhalation. | |
