Detecting method and apparatus using heat sensitive devices
Patent 4756670 Issued on July 12, 1988. Estimated Expiration Date: 
October 17, 2006. 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.
October 17, 2006. 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 2947938 3408940 3518814 3597676 3683692 Fluid flow measuring system Arrangement for drift compensation in a gas analyzer Method and apparatus for measuring fluid flow and/or for exercising a control in dependence thereon Anesthesia detector and display apparatus Gas analyzer InventorAssigneeApplicationNo. 06/920530 filed on 10/17/1986US Classes:417/43, Responsive to change in rate of pump fluid flow417/45, By changing electrical characteristic of motor or motor circuit600/532, Qualitative or quantitative analysis of breath component73/204.15Including detail of feedback or rebalancing circuitryExaminersPrimary: Freeh, William L.Assistant: Neils, Paul F. Attorney, Agent or FirmInternational ClassesG01F 1/698 (20060101)G01F 1/68 (20060101) G01F 1/696 (20060101) AbstractThis invention relates generally to the sensing of phenomena using heat sensitive devices. More particularly, the invention relates to an improved method and system wherein the ratio of the dissipation coefficients of a pair of electrically heated matched temperature sensitive devices is detected, which method and system are insensitive to variation in ambient temperature.Other References
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