Portable circuit and method for performing a time study and analysis of bodily ionic characteristics
Patent 4618929 Issued on October 21, 1986. Estimated Expiration Date: 
October 21, 2003. 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 21, 2003. 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 3889255 Device for measuring pH and temperature of a liquid, which includes a memory Circuit and method for the radiotelemetry of esophageal pH in an ECG radiotelemetry system Medical-electronic body fluid accounting system Patent #: 4449538 InventorsAssigneeApplicationNo. 06/491455 filed on 05/04/1983US Classes:600/348, Determining ion concentration/partial pressure600/350Esophageal or gastrointestinal fluidsExaminersPrimary: Smith, JerryAssistant: Meyer, Charles B. Attorney, Agent or FirmInternational ClassesA61B 5/05 (20060101)G01N 27/28 (20060101) AbstractA portable circuit and method for performing a time study and analysis of bodily ionic characteristics as esophageal pH includes a transducer 11 for measuring pH and generating a proportional analog signal and an interface 12 for converting this signal into a representative digital signal including offset and gain controls 23,24 for permitting correction for transducer 11 calibration drift during the study period. A processor 14 receives and stores all digital signals for rapid transmission to a data analysis after the study period is ended. Esophageal pH values are measured and stored for a plurality of pre-study and post-study known conditions.Other References
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