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. 26, 2008
Filed:
Aug. 30, 2004
Kiyotaka Yanagi, Ageo, JP;
Atsushi Koike, Ageo, JP;
Toshimi Nakamura, Ageo, JP;
Kiyoshi Yamagishi, Ageo, JP;
Hideshi Sekimori, Ageo, JP;
Kiyotaka Yanagi, Ageo, JP;
Atsushi Koike, Ageo, JP;
Toshimi Nakamura, Ageo, JP;
Kiyoshi Yamagishi, Ageo, JP;
Hideshi Sekimori, Ageo, JP;
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Abstract
A leak detector comprising a sensor unit including a measuring slim-tube () via the lower end of which a liquid in a tank is led in/out, a measuring tube () connected to the upper end thereof and having a sectional area larger than that thereof, and temperature sensors () and a heater () provided to the slim-tube (), and a leak detection control unit () connected to the sensor unit. The leak detection control unit () has a pulse voltage generating circuit for applying a single pulse voltage to the heater () and a leak detecting circuit that is connected to the temperature sensors () and produces an output equivalent to a temperature difference sensed by these temperature sensors, whereby a value equivalent to a liquid flow rate is calculated by integrating the difference between an output from the leak detecting circuit and its initial value according to a single pulse voltage applied to the heater () by the pulse voltage generating circuit, and leakage of liquid from the tank is detected based on this value.