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:
Jul. 28, 1987
Filed:
Oct. 05, 1983
Joseph M Prahl, East Cleveland, OH (US);
Werner W Kochte, East Cleveland, OH (US);
The Scott & Fetzer Company, Twinsburg, OH (US);
Abstract
The vacuum generating system for a hand-held vacuum cleaner comprises a fan or impeller having backwardly curved arcuate blades extending between preferably frusto-conical wall portions of front and rear fan shrouds. The front fan shroud is associated with the fan housing to provide a slip seal against vacuum loss around the sides of the fan. The centers of curvature of the arcuate blades are parallel to the central axis of the fan. Although the air flow passages defined by the blades and front and rear shrouds are of complex shapes, the fan may be manufactured economically. The air watts performance curve of the fan is desirably blunted or flattened without significant reduction of altitude or maximum height as compared to prior cleaners.