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:
Feb. 05, 2002
Filed:
Apr. 27, 2001
Applicant:
Inventor:
Michael B. Schell, Santa Barbara, CA (US);
Assignee:
Edwards Systems Technology, Inc., Cheshire, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B 1/710 ;
U.S. Cl.
CPC ...
G08B 1/710 ;
Abstract
A method for indicating a condition of oxygen depletion in a space, is disclosed. The method of measuring oxygen depletion is employed using the rate of change of carbon dioxide as a surrogate indicator of the amount of oxygen being depleted or displaced in the air. Displacement may be measured when the rate of change of carbon dioxide concentration falls within a rate of change range, or rises above or falls below a rate of change threshold level that indicates the displacement of oxygen.