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:
Nov. 29, 2011
Filed:
Nov. 11, 2008
Ichiro Mitsutake, Tokyo, JP;
Ichiro Mitsutake, Tokyo, JP;
Yamatake Corporation, Tokyo, JP;
Abstract
An electromagnetic flowmeter that prevents fluctuations in the frequency of synchronized pulse signals due to momentary fluctuations of the power source voltage. The comparator of an AC synchronizing circuit that generates pulse signals synchronized to the frequency of a commercial power source is given a hysteresis function in which a first threshold value Vthand a second threshold value Vthare set up in the comparator. The comparator compares the level of divided AC signals from a dividing circuit with the first threshold value Vth, and if the level of the divided AC signals exceeds the first threshold value Vth, the level of the synchronized pulse signals is inverted from the 'L' level to the 'H' level; and if the level of the divided AC signals falls below the second threshold value Vth, the level of the synchronized pulse signals is inverted from the “H” level to the “L” level.