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:
Jan. 21, 1986
Filed:
Jun. 29, 1984
Applicant:
Inventors:
Katsumi Sakai, Kanazawa, JP;
Isao Toyoshima, Ishikawa, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310338 ; 310320 ; 310323 ; 310337 ; 310366 ; 310340 ;
Abstract
A liquid sensor mounted on the side wall of a liquid tank for detecting the existence of liquid in the tank. The sensor includes an element which generates a vibration in the direction of its thickness, of energy-trapped type for detecting the existence of liquid. The element consists of electrodes provided on both sides of a piezo-electric substrate, one side of the element for contacting the liquid in the tank being covered with a liquid-proof coating. The existence of liquid is detected from the change in resonance impedance or antiresonance impedance resulting from the liquid contact.