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From: donpat3/26/2015 1:02:28 PM
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You can't fault these guys for not trying:

United States Patent Application 20150068270

Johnson; Royce W. ; et al.

March 12, 2015

Background Cancellation with Electronic Noses

Abstract
A method and apparatus for background cancellation for electronic noses to make automated aroma analysis practical in complex field environments. The system and methods compensate for background contaminants while automatically emphasizing all constituents, be they chemically identified or not, which represent information content in the sample being tested.

Inventors:
Johnson; Royce W.; (Universal City, TX) ; Tikhonski; Alexei; (Cedar Park, TX)

Applicant:
Johnson; Royce W.
Tikhonski; Alexei

Assignee:
Applied Nanotech Holdings, Inc.
Austin
TX

Claims
1. A system for analyzing an aroma emanating from a source, comprising: a test sample of gas containing an unknown chemical composition produced by the source; a reference sample of gas containing an unknown background chemical that is not produced by the source; one or more gas analyzers suitable for receiving the test sample of gas and the reference sample of gas and outputting it least a two-dimensional odorgram pertaining to the received test sample of gas and the reference sample of gas; and an iterative adaptive function implemented as a software program operating on a computer, the iterative adaptive function suitable for suppressing the unknown background chemical from the odorgram so that an identity of the unknown chemical composition can be determined.

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