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. 17, 1996
Filed:
Nov. 01, 1995
Applicant:
Inventors:
Erich Frank, Hochdorf, DE;
Fritz Mohring, Ostfildern, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D / ;
U.S. Cl.
CPC ...
415119 ; 415 554 ;
Abstract
A device for reducing the generation of noise in a fan (11) having a gas intake channel (13), a gas discharge channel (14) and a gas propulsion device (15), in particular a side channel fan for supplying combustion air in a heater. At least in the regions of the opening cross-section (18, 19) of the gas intake channel (13) and/or the gas discharge channel (14) there is disposed structure for inducing a flow resistance (interference structure 20, 21).