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. 24, 2015
Filed:
Apr. 07, 2011
Michael K. Forster, White Hall, MD (US);
Jason K. Leh, Rosedale, MD (US);
Wing W. Lin, Bel Air, MD (US);
Michael K. Forster, White Hall, MD (US);
Jason K. Leh, Rosedale, MD (US);
Wing W. Lin, Bel Air, MD (US);
Black & Decker Inc., Newark, DE (US);
Abstract
A power tool including a motor, an input unit such as a variable-speed trigger switch, and a controller is provided. The controller controls the speed of the motor as a function of the input level indicated by the electrical signal from the input unit. The function is a first expression within a first predetermined range of the input level and a second expression within a second predetermined range of the input level, where the second expression corresponds to a polynomial of a second degree or higher and is different from the first expression.