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:
Jun. 01, 1982
Filed:
Jun. 09, 1980
Applicant:
Inventor:
Daniel C MacManus, Owosso, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
7386189 ;
Abstract
A fan in a duct driven by a permanent magnet D.C. motor powered by a constant voltage source varies in speed according to the airflow through the duct. The current drawn by the motor is a direct function of the air speed and the density. The motor current is measured to provide a measure of mass airflow.