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:
Oct. 10, 1978
Filed:
Aug. 29, 1977
Yasuo Kuraoka, Sapporo, JP;
Astushi Kurosawa, Sapporo, JP;
Tetsuo Shirai, Sapporo, JP;
Katsuro Saito, Sapporo, JP;
Hoxan Co., Ltd., Sapporo, JP;
Abstract
In a liquid level indicator for an extremely low temperature-liquefied gas wherein a current is caused to flow through a superconductor wire immersed in the extremely low temperature-liquefied gas, a voltage across terminals of the superconductor wire is measured, and the liquid level of the liquefied gas lying between the terminals is gauged on the basis of the measured value, the improvement therein comprising the providing of a current supply portion which, at first, increases the current to be fed to the superconductor wire up to the so-called plateau region in a current - voltage hysteresis curve of the superconductor wire, and thereafter, decreases it down to a return-path rectilinear region in the curve departing from the plateau region, the liquid level being gauged on the basis of the measured value of the terminal voltage of the superconductor wire as obtained by the use of the decreased current. The improved liquid level indicator is capable of measuring the liquid levels of, for example, helium over from the normal-pressure state to the superfluid state.