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:
Jul. 29, 1980
Filed:
Sep. 29, 1978
Heinz Lauterbach, Esslingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
Airflow measuring apparatus utilizes a temperature-varying resistance layer on a carrier as a sensor. The resistance and temperature of the temperature-varying resistance layer are maintained substantially constant by a regulator circuit, independent of the amount of cooling by air flowing past the element. To minimize errors resulting from heating and cooling of the carrier, the surface of the carrier which does not have the temperature-varying resistance element is covered by a temperature-independent resistance layer and the current through the temperature independent resistance layer is controlled such that the temperature independent resistance layer is at substantially the same temperature as the temperature-varying resistance layer. Thus thermal gradients in the carrier are eliminated.