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:
Mar. 28, 2000
Filed:
Sep. 12, 1997
Karl Herzog, Frankfurt, DE;
Braun GmbH, , DE;
Abstract
The invention is directed to an impeller (1) for a hair dryer or a hair dryer accessory device, which includes an impeller blade (6) by means of which the impeller (1) is adapted to be set in rotation about an axis (3) by a current of air (8). The impeller blade (6) possesses variable aerodynamic properties, particularly an effective surface impinged by the current of air (8) which is variable in response to the rotational frequency of the impeller blade (6). In particular the free end (7) of the impeller blade (6) is of an elastic configuration, causing it to be bent more or less severely under the action of the centrifugal force. This variation in the effective surface of the impeller blade (6) enables the rotational frequency of the impeller (1) to be maintained at an approximately constant value.