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:
Dec. 25, 2012
Filed:
Mar. 10, 2010
Markus Lang, Wabern, CH;
Peter Möri, Walperswil, CH;
Renzo Moser, Gümmenen, CH;
Nestec S.A., Vevey, CH;
Abstract
A level detection device for detecting an upper surface of a liquid at a reference level. The device includes a reservoir having a bottom wall and one or more side walls that delimit a cavity for containing the liquid; a light emitter for emitting a light beam towards this cavity; at least one reflection surface for reflecting the light beam; and a light detector for detecting the emitted light beam upon reflection. The emitter and detector are so arranged that, when the surface of the liquid passes the reference level, a state of detection of the light beam by the detector is changed. The emitter, detector and reflection surface(s) are so located and oriented relative to the cavity that the emitted light beam is: detectable by the detector upon travelling through the liquid in the cavity; and refractable at the surface of the liquid towards or away from the detector so that the state of detection is a function of such refraction.