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. 09, 1985
Filed:
Jun. 09, 1983
Applicant:
Inventor:
Alvin E Brown, Santa Cruz, CA (US);
Assignee:
Manning Technologies, Inc., Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ; G01F / ;
U.S. Cl.
CPC ...
7386128 ; 73-3 ;
Abstract
A calibration circuit for an ultrasonic flowmeter of the type described in U.S. Pat. No. 3,981,191 wherein a frequency counted variable delay is used to simulate flow. A stable gated oscillator is used to feed a counter whose accuracy is checked against a frequency standard. A BCD switch is used to load the counter with a count representing a desired variable delay. When the count is reached the oscillator is stopped and a variable delay signal is put out by the counter, to be combined with a fixed delay signal for simulation of flow in the upstream or downstream channel of the flowmeter.