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:
Mar. 10, 1992
Filed:
Aug. 20, 1990
Applicant:
Inventors:
Charles G Emmert, Jr, Grand Blanc, MI (US);
Edward J Martin, Luxembourg-Belair, LU;
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
7320425 ;
Abstract
A cylindrical heated airflow sensor for a constant temperature anenometer has a solid or tubular fused silica substrate with leads or terminals connected to each end. The sensor has a central heated section densely wound with resistive wire or covered with a resistive film, and an unheated section between the heated section and each terminal. Due to low heat conductivity of the substrate, the unheated section insulates the heated section from the terminals to improve the accuracy of the sensor at low airflow rates.