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:
Sep. 30, 1980
Filed:
Sep. 18, 1978
Applicant:
Inventor:
Gerhard Sturm, Mulfingen, DE;
Assignee:
EBM Elektrobau Mulfingen GmbH & Co., Mulfingen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ; F04D / ;
U.S. Cl.
CPC ...
415207 ; 4152 / ; 417354 ;
Abstract
An axial-flow fan includes an impeller and a supporting member, a hollow elongated casing having a circumferential wall, an inlet and an outlet axially spaced from the inlet and defining with the circumferential wall the interior of the casing accommodating the impeller and the supporting member. The circumferential wall comprises a first conical annular portion adjacent to the inlet and diverging in the direction from the outlet to the inlet, a second conical annular portion adjacent to the outlet and diverging in the direction from the inlet to the outlet.