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. 15, 1992
Filed:
Jan. 18, 1991
Applicant:
Inventors:
Richard D Williamson, New Brighton, MN (US);
Michael J Franklin, Apple Valley, MN (US);
Assignee:
Twin City Fan & Blower Co., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01D / ;
U.S. Cl.
CPC ...
4162 / ; 416181 ;
Abstract
An improved centrifugal fan wheel adapted to receive a flow medium for radially accelerated discharge by plurality radially extending impeller blades. A plurality of flow medium passage channels are positioned radially inwardly of an outer extent of the fan wheel to improve the efficiency of the fan. The flow medium passage channels are defined by alternating cutouts disposed between adjacent blades about the outer extent of a fan wheel back plate.