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:
Apr. 02, 1991
Filed:
Oct. 02, 1989
Applicant:
Inventor:
Shrinivas G Joshi, New Berlin, WI (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
7320423 ; 7320415 ;
Abstract
The use of a surface acoustic wave (SAW) device to measure rate of fluid flow. A SAW oscillator heated to a suitable temperature above ambient is placed in the path of the flowing fluid. Convective cooling caused by fluid flow results in a change in the oscillator frequency. A 73 MHz oscillator fabricated on 128.degree. rotated Y-cut lithium niobate substrate and heated to 55.degree. C. above ambient shows a frequency variation greater than 142 kHz for flow rate variation from 0 to 1000 cm.sup.3 /min.