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. 25, 1981
Filed:
Jul. 27, 1979
Applicant:
Inventors:
Seppo J Leskinen, Vasterskog, FI;
Olli J Pukkila, Helsinki, FI;
Assignee:
Oy Mercantile AB, Helsinki, FI;
Primary Examiner:
Int. Cl.
CPC ...
F04D / ; B21K / ;
U.S. Cl.
CPC ...
416185 ; 2915 / ; 74572 ; 1131 / ; 416D / ;
Abstract
Disclosed is a centrifugal-blower impeller, which consists of a center part and radially outer part, which has a smaller thickness of material than the center part. The outer part consists of ring segments attached by welding to the periphery of the center part. The ring segments are first welded to the center part and thereafter radially to each other so that the ring segments are subject to tensile stress and the center part to compressive stress.