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:
Mar. 18, 1980
Filed:
Aug. 21, 1978
Nagaoki Kayama, Tokyo, JP;
Kazuie Suzuki, Tokyo, JP;
Hokushin Electric Works, Ltd., Tokyo, JP;
Abstract
A technique for exciting the electromagnet of a magnetic flowmeter in which a fluid to be metered is conducted through a flow tube having detecting electrodes, the fluid intercepting a magnetic field established by the electromagnet to induce a signal in the electrodes indicative of flow in a high flow-rate range as well as in a low flow-rate range. In this technique, derived from the electrode signal is a control signal whose frequency is a function of the velocity of the fluid passing through the tube, the excitation current supplied to the electromagnet being governed by the control signal so that it has a frequency which is higher in the high flow-rate range and lower in the low flow-rate range.