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:
May. 25, 2021
Filed:
Nov. 29, 2017
Applicant:
Koninklijke Philips N.v., Eindhoven, NL;
Inventor:
Jeroen Christian Nijdam, Drachten, NL;
Assignee:
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B26B 19/38 (2006.01); B26B 19/04 (2006.01); B26B 19/14 (2006.01);
U.S. Cl.
CPC ...
B26B 19/388 (2013.01); B26B 19/3853 (2013.01); B26B 19/04 (2013.01); B26B 19/14 (2013.01);
Abstract
The present invention is directed to a hair cutting apparatus (), such as a shaver, which is enabled to detect whether hair is currently being cut in a robust way. Such apparatus has a motor () for driving a cutting element. The motor current () is evaluated by filtering and amplifying it in such a way that a time derivative of the motor current () is processed and other parts of the motor current (), such as noise and DC-5 parts, are eliminated. An evaluator determines whether the time derivative of the motor current is above a predefined threshold value.