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:
Feb. 20, 1996
Filed:
Dec. 28, 1994
Applicant:
Inventor:
Herman L Renger, Calabasas, CA (US);
Assignee:
Pacesetter, Inc., Sylmar, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; G01F / ; A61B / ;
U.S. Cl.
CPC ...
219497 ; 219501 ; 219505 ; 219504 ; 7320419 ; 7320418 ; 7320414 ; 604246 ; 374 39 ; 128692 ;
Abstract
A fluid flow rate measuring apparatus having a thermistor exposed to a flow of fluid and a driver circuit operable in an initial constant-voltage mode, in which it applies a substantially constant voltage across the thermistor, and a subsequent constant-current mode, in which it applies a substantially constant current through the thermistor, such current corresponding to the current level at the end of the constant-voltage mode. A voltage sensor measures the resultant voltage drop across the thermistor, which is a direct measurement of the fluid flow rate and which is substantially insensitive to variations in ambient temperature.