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:
Oct. 18, 2005
Filed:
Apr. 12, 2002
Applicant:
Heinz-peter Frerichs, St. Peter, DE;
Inventor:
Heinz-Peter Frerichs, St. Peter, DE;
Assignee:
Micronas GmbH, Freiburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N027/26 ; H01L023/58 ;
U.S. Cl.
CPC ...
Abstract
The invention relates to a sensor for measuring ion concentration or gas concentration, with a gas- or ion-sensitive layer () that has two sensitive partial areas (and), two conducting areas (and), each coupled capacitively through air gaps (and) with one of the sensitive partial areas (and), with the capacitances of the couplings being different, and a comparison circuit () which has at least one first transistor (T) connected with the first conductive area and a second transistor (T) connected with the second conductive area, and at least one output at which a signal can be tapped that depends on the potential of sensitive layer (