Portable pH data collector
Patent 4546436 Issued on October 8, 1985. Estimated Expiration Date: 
July 6, 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.
July 6, 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 ReferencesDevice 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 Apparatus and methods for recording time intervals Method and apparatus for pH recording Patent #: 4384586 InventorsAssigneeApplicationNo. 06/511383 filed on 07/06/1983US Classes:600/361, pH346/33ME, Medical environment600/373, Electrode placed in body700/74Variable rateExaminersPrimary: Smith, JerryAssistant: Woo, Louis Attorney, Agent or FirmInternational ClassesA61B 5/00 (20060101)G01N 27/28 (20060101) G01N 33/487 (20060101) AbstractThe present invention provides an apparatus for continuously recording physiological data. The invention includes a unique data mapping and compression technique which allows relatively long term data acquisition without compromising the data sampling rate. The present physiological data recorder has application in recording physiological data which is non-periodic and is characterized by "bursts" of rapid activity interspersed among relatively long periods during which there is little or no activity. The invention has specific application in recording pH data in ambulatory patients and comprises a unique data compression means, an automatic calibration means, and a digital or analogue data playback means.Other References
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