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:
Apr. 09, 2002
Filed:
Mar. 31, 2000
Ryouei Nozawa, Kanagawa, JP;
Akira Sugiyama, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A detecting device of the present invention includes a U-shaped case, a horn disposed in a leg portion of the case and outputting sound waves, a receiver disposed in a leg portion and converting sound waves received from the horn to electric signals having a voltage corresponding to a sound volume of the sound waves, and a comparator which outputs detection signals when voltages of the electric signal from the receiver equal to or are more than a threshold. By outputting the detection signal when the sound waves going out from the leg portion and entering into the leg portion pass through only the liquid, it is judged whether a liquid surface of the liquid stored in a reservoir tank equals to or is higher than a predetermined value.