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:
Jan. 27, 2015
Filed:
May. 04, 2011
Applicants:
Thomas M. Rezachek, Cottage Grove, MN (US);
Gary P. Shubinsky, Buffalo Grove, IL (US);
Michael Freeman, Northville, MI (US);
Inventors:
Thomas M. Rezachek, Cottage Grove, MN (US);
Gary P. Shubinsky, Buffalo Grove, IL (US);
Michael Freeman, Northville, MI (US);
Assignee:
Honeywell International Inc., Morristown, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 21/00 (2006.01); G01N 21/17 (2006.01);
U.S. Cl.
CPC ...
G01N 21/1702 (2013.01);
Abstract
A photoacoustic detector wherein control circuits compensate for long term variations of components therein including a light source and sensing microphones. The control circuits intermittently energize the source to evaluate changes in at least source resistance. The control circuits intermittently energize an acoustic generator to evaluate changes in one or more generator responsive microphones.