Temperature and humidity compensation for gas detection apparatus

Patent 4730479 Issued on March 15, 1988. Estimated Expiration Date:

June 23, 2006. 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.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

The Standard Oil Company

Application

No. 06/877631 filed on 06/23/1986

US Classes:

73/23.21With compensation detail (for error or drift correction, etc.)

Examiners

Primary: Levy, Stuart S.
Assistant: Williams, Hezron

Attorney, Agent or Firm

International Classes

G01N 27/403 (20060101)
G01N 27/414 (20060101)
G01N 33/00 (20060101)

Abstract

The use of multiple field effect transistors, wherein only one transistor is sensitive to the presence of a particular element, is disclosed whereby similar responses to temperature and/or humidity fluctuations may be subtracted yielding a response to a particular element that is relatively insensitive to temperature and/or humidity variations.