Noninvasive diagnosis of gastritis and duodenitis
Patent 4947861 Issued on August 14, 1990. Estimated Expiration Date: 
May 1, 2009. 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.
May 1, 2009. 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 2795223 3303840 3426745 3544273 3734692 3777571 3858573 Method and device for analyzing human breath Fluid control valves with angled metering ports Water separator Patent #: 4821737 InventorApplicationNo. 345843 filed on 05/01/1989US Classes:600/532, Qualitative or quantitative analysis of breath component128/898, Methods600/543Breath collectionExaminersPrimary: Green, Randall L.Assistant: Reichle, K. M. Attorney, Agent or FirmForeign Patent References
International ClassA61O 005/08AbstractA patient to be treated for the presence of Campylobacter pylori in the stomach and/or duodenum ingests a quantity of urea and after about 10 minutes exhales into breath collection apparatus to provide a breath sample of alveolar air, collected during the last part of the exhalation. Immediately upon issuing from the patient the expired breath is passed in contact with a preferably solid-state body of alkaline hygroscopic material, e.g. sodium hydroxide, that substantially removes water vapor from the breath but is inert to ammonia in the presence of water. The breath sample, thus dehydrated, is delivered to a sensor which signals the presence of ammonia in it, to indicate presence of C. pylori in the stomach.Other References
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