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:
Nov. 28, 1995
Filed:
Oct. 29, 1993
Lennart W Castwall, Taby, SE;
Aktiebolaget Electrolux, Stockholm, SE;
Abstract
A kitchen ventilator includes a housing (10) having a motor powered fan (20), an inlet (11), an inlet passage (25) between the inlet and the fan, an outlet (17), and an outlet passage (23) between the fan and the outlet, the passages are separated by a generally vertical partition wall (22). The inlet passage is partially formed by a baffle wall (26) provided between the inlet and the fan, and a removable front wall (16) provided with a sound absorbing material, and the outlet passage (23) has a narrowing portion (33) which is provided on both sides with sound absorbing material (18, 19). For reducing the noise level, the ventilator is provided with an acoustic sensor (28) for sensing the noise of the fan, a loudspeaker (30) for emitting a sound silencing the fan noise in reverse phase therewith, and an electronic control unit (29) connected to the sensor and the loudspeaker and adapted to control the loudspeaker in response to information received from said sensor.