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:
Aug. 04, 2015
Filed:
Jun. 28, 2011
Stefan Jonsson, Stockholm, SE;
Fredrik Sjöberg, Bromma, SE;
Henrik Troberg, Segeltorp, SE;
Aktiebolaget Electrolux, , SE;
Abstract
This invention relates to a dust indicator in a vacuum cleaner, which dust indicator () is arranged in a wall () at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of the wall during operation of the vacuum cleaner. The dust indicator comprises an air channel () having an air inlet () arranged at an outer side of the wall, and an air outlet () arranged at an inner side of the wall, such that an airflow is directed into the space during operation of the vacuum cleaner due to the negative pressure. The dust indicator further comprises a sensor () arranged for detecting dust by means of sending and/or receiving an electromagnetic signal which is transmitted through the space. The air channel is arranged such that the airflow prevents dust from sticking in an area of the path of the electromagnetic signal of the sensor. The sensor is arranged behind a transparent window () such that it is shielded from dust and debris within said space.