The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2006
Filed:
Nov. 13, 2002
Todd W. Hubbard, Lake Forrest Park, WA (US);
David L. Putnam, Sammamish, WA (US);
Todd W. Hubbard, Lake Forrest Park, WA (US);
David L. Putnam, Sammamish, WA (US);
Photonic Biosystems, Inc., Sammamish, WA (US);
Abstract
A rapid, non-invasive breath-test method and device for diagnosing the presence or absence ofin a subject without administration of isotopic tracers is described. The device consists of a highly sensitive colorimetric ammonia sensor placed in contact with sampled subject breath. The sensor is measured using appropriate reflection spectroscopy instrumentation. The breath-test method consists of measuring a basal ammonia level with the device, administering non-isotopic urea and continuing measurement of the ammonia content in a plurality of consecutive breaths. Diagnostic differences in breath ammonia are identified betweeninfected and uninfected individuals.